Jahresübersicht für das Jahr 2023
05 Jan 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Nir Bar-Gill, Hebrew University, Jerusalem, Israel | |
The study of open quantum systems, quantum thermodynamics and quantum many-body spin physics in realistic solid-state platforms, has been a long-standing goal in quantum and condensed-matter physics.
In this talk I will address these topics through the platform of nitrogen-vacancy (NV) spins in diamond, in the context of purification (or cooling) of a spin bath as a quantum resource and for enhanced metrology and sensing.
I will first describe our work on characterizing noise using robust techniques for quantum control ([1], in collaboration with Ra’am Uzdin). Suppression of such noise can be related to control and cooling of the spin-bath surrounding the NV, using a single optically pumped NV quantum central spin as a refrigerator [2]. I will then present a general theoretical framework we developed for Hamiltonian engineering in an interacting spin system [3]. This framework is applied to the coupling of the spin ensemble to a spin bath, including both coherent and dissipative dynamics [4]. Using these tools I will present a scheme for efficient purification of the spin bath, surpassing the current state-of-the-art and providing a path toward applications in quantum technologies, such as enhanced MRI sensing.
Finally, if time permits, I will describe our work in using NV-based magnetic microscopy to implement quantum sensing in various modalities. I will present measurements of 2D vdW magnetic materials, and specifically the phase transition of FGT through local imaging of magnetic domains in flakes of varying thicknesses [5], as well as a technique for sensing radical concentrations through the change in the charge state of shallow NVs ([6], in collaboration with Uri Banin).
1. T. Zabelotsky et. al., in preparation.
2. P. Penshin et. al., in preparation.
3. K. I. O. Ben’Attar, D. Farfurnik and N. Bar-Gill, Phys. Rev. Research 2, 013061 (2020).
4. K. I. O. Ben’Attar et. al., in preparation.
5. G. Haim et. al., in preparation.
6. Y. Ninio et. al., ACS Photonics 8, 7, 1917-1921 (2021). | |
|
09 Jan 2023
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., Munich |
| Nicolo Piazzalunga, Uppsala U. | |
I'll introduce the higher-rank Donaldson-Thomas theory for toric Calabi-Yau three-folds, within the setting of equivariant K-theory.
I'll present a factorization conjecture motivated by Physics.
As a byproduct, I'll discuss some novel properties of equivariant volumes, as well as their generalizations to genus-zero Gromov-Witten theory of non-compact toric varieties. | |
| at Zoom | |
|
10 Jan 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Nico Döttling, Helmholzt Center for Information Security (CISPA) in Saarbrücken | |
In the early 1990s cryptography went into a foundational crisis when efficient quantum algorithms were discovered which could break almost all public key encryption schemes known at the time. Since then, an enormous research effort has been invested into basing public key cryptography, and secure computation in general, on problems which are conjectured to be hard even for quantum computers. This research program has been resoundingly successful, leading to unexpected developments, such as the discovery of fully homomorphic encryption schemes. Furthermore, cryptography research has now moved beyond just "post-quantum security”, i.e. security against quantum adversaries, and investigates cryptographic protocols for a (still hypothetical) quantum world, where not just adversaries, but also honest users have access to scalable quantum computers and quantum communication channels. This enables applications such as quantum money, which are impossible using purely classical information. In this talk I will give an overview of the field and some of the (in my opinion) most challenging open problems. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Tim Höhne, TU Dortmund | |
We address the notorious metastability of the standard model (SM) Higgs potential and promote it to a model building task: What are the new ingredients required to stabilize the SM up to the Planck scale without encountering subplanckian Landau poles? Using the SM extended by vector-like fermions, we chart out the corresponding landscape of Higgs vacuum stability. We find that the gauge portal mechanism, triggered by new SM charge carriers, opens up sizeable room for stability in a minimally invasive manner.
We also find models with Yukawa portals into Higgs stability opening up at stronger coupling. Several models allow for vector-like fermions in the TeV-range, which can be searched for at the LHC. For nontrivial flavor structure of Yukawa couplings severe FCNC constraints arise which complement those from stability, and push lower fermion masses up to a few hundred TeV. | |
|
11 Jan 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Valentina Santoro, ESS, Lund, Sweden | |
The European Spallation Source, ESS, currently under construction in Lund, will be the world’s most powerful facility for research using neutrons. Supported by 3MEuro Research and Innovation Action within the EU Horizon 2020 program, a design study (HighNESS) is now underway to develop a second neutron source below the spallation target. Compared to the first source, located above the spallation target and designed for high cold and thermal brightness, the new source will provide a higher intensity (the total number of neutrons from the moderator), and a shift to longer wavelengths in the spectral regions of Cold (4-10 ˚A), Very Cold (10-100 ˚A), and Ultra Cold (> 500 ˚A) neutrons. The core of the second source will consist of a large liquid deuterium moderator to deliver a high flux of cold neutrons and to serve secondary VCN and UCN sources, for which different options are under study. The features of this new source will boost several areas of condensed matter research and will also provide unique opportunities in fundamental physics with the neutron antineutron oscillations experiment NNBAR. This experiment will search for the baryon number violating process of n → ¯n oscillation with a sensitivity of three orders of magnitude over the previously attained limit obtained at the Institut Laue-Langevin ILL. As a part of the HighNESS project work is ongoing to deliver the Conceptual Design Report of the experiment.
Concerning the design of the Ultra Cold Neutron and Very cold neutron source for the ESS, a digital workshop has been held from February 2nd to February 4th, 2022 where experts from various laboratories and Universities have gathered to propose and discuss ideas and challenges for the development of these sources. During the course of the workshop, several possibilities have been identified on where to locate the VCN and UCN sources. The UCN source could be placed in close vicinity or at some distance from the primary cold source. Regarding the VCN source, we have identified two possibilities. In the first option, the VCNs are extracted from the main CN source using advanced reflectors. While in the other case we make use of a dedicated VCN converter, for which a material capable of delivering a high flux of VCNs is needed. From the point of view of neutronic performance, two promising materials, which are under study in the HighNESS project, are solid deuterium at about 5 K and deuterated clathrate hydrates at around 2 K. In summary in the the talk, the referent will discuss the HighNESS project, the status of the NNBAR experiment and all
the possibilities for a dedicated UCN and VCN source at the ESS. Slides here... | |
|
12 Jan 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Dr. Andreas Mooser, MPI für Kernphysik, Heidelberg | |
The hyperfine structure of hydrogen like ions are a unique probe to access nuclear magnetic moments and nuclear structure. Thus, while eliminating the ignorance of essential links in metrology due to insufficiently known magnetic moment, at the same time these ions provide complementary insight into the inner nucleus. The very recently started ³He experiment exploits these characteristics to provide a new standard for absolute precision magnetometry and determine the nuclear charge and current distribution of ³He.
To this end, a novel four Penning trap experiment was designed and built. Using novel techniques, this system enables non demolition measurements of the nuclear quantum state and allows sympathetic laser cooling of single, spatially separated ions to sub-thermal energies [1].
In the first measurement campaign, ³He was investigated by exciting microwave transitions between the ground state hyperfine states. This enabled us to determine the nuclear g-factor, the electronic g-factor and the zero field ground state hyperfine splitting of ³He with a precision of 5*10 -10, 3*10 -10 and 2*10 -11, respectively [2].
Our measurement constitutes the first direct and most precise determination of the ³He nuclear magnetic moment. The result is of utmost relevance for absolute precision magnetometry, as it allows the use of He NMR probes as an independent new standard with much higher accuracy. In addition, the comparison to advanced theoretical calculations enables us to determine the size of the ³He nucleus with a precision of 2.4*10 -17 m.
In future, we aim at a direct determination of the bare nuclear magnetic moment of ³He to be compared to the bound state result. For this measurement, it is essential to implement new methods and technology such as sympathetic laser cooling and a high precision voltage source based on Josephson junctions [3]. The latest results, status and the future prospect of the experiment will be presented.
References
[1] A Mooser et al., J. Phys.: Conf. Ser. 1138, 012004 (2018)
[2] A. Schneider et al., Nature 606, 878 (2022)
[3] A. Schneider et al., Ann. Phys. 531, 1800485 ( 2019) | |
|
16 Jan 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Cloé Girad-Carillo, Institut für Physik | |
Searching for the Neutrinoless double beta decay with the SuperNEMO demonstrator: installation, commissioning and sensitivity study | |
| at Zoom | |
|
17 Jan 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Georg von Freymann, TU Kaiserslautern | |
Photonic quantum simulation and sensing
Georg von Freymann1,2
1Physics Department and Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern Landau RPTU, 67663 Kaiserslautern, Germany
2Fraunhofer Institute for Industrial Mathematics ITWM, 67663 Kaiserslautern, Germany
Applications of quantum technology are highly sought-after and thus supported by public funding agencies. However, the meaning of application varies depending on who you talk to: In the physics community application often means a useful laboratory implementation, while from an industrial perspective, application means solving a measurement problem in production or even creating a saleable product.
To address the physics perspective, I will discuss 3D µ-printed photonic quantum simulators based on coupled waveguide system, focusing on topological protection and Floquet (time-periodic) driving. Such experimental model systems allow for studying these phenomena under very well controlled conditions. Examples are periodic driving of topologically protected edge modes in the one-dimensional Su-Schrieffer-Heeger-chain leading to depopulation of the edge mode despite topological protection [1], periodic driving of two-dimensional honey-comb-lattices establishes topological protection in an otherwise topologically trivial model system [2], switching of topological protection via excitation with and without orbital angular momentum of light [3], and establishing higher-order topological insulators using p-orbitals of the waveguides [4].
From the industry perspective I discuss recent results for terahertz quantum-sensing with undetected photons [5] allowing to measure terahertz spectral properties with visible light only, enabling both single-shot layer thickness measurements as well as spectroscopy.
[1] Z. Cherpakova, C. Jörg, et al., Limits of topological protection under local periodic driving, Light: Science&Applications 8, 63 (2019).
[2] C. Jörg, et al., Dynamic defects in photonic Floquet topological insulators, New J. Phys. 19, 083003 (2017).
[3] C. Jörg, et al., Artificial gauge field switching using orbital angular momentum modes in optical waveguides, Light: Science&Applications 9, 150 (2020).
[4] J. Schulz, J. Noh, et al., Photonic quadrupole topological insulator using orbital-induced synthetic flux, Nature Communications 13, 6597 (2022)
[5] M. Kutas et al, Terahertz Quantum Sensing, Science Advances 6, eaaz8065 (2020) | |
|
Theorie-Palaver
Institut für Physik 14:15 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Carlos Tamarit, JGU Mainz | |
The characteristics of the cosmic microwave background provide circumstantial evidence that the hot radiation-dominated epoch in the early universe was preceded by a period of inflationary expansion. Here, it will be shown how a measurement of the stochastic gravitational wave background can reveal the cosmic history and the physical conditions during inflation, subsequent pre- and reheating, and the beginning of the hot big bang era. This will be exemplified with a particularly well-motivated and predictive minimal extension of the Standard Model which is known to provide a complete model for particle physics -- up to the Planck scale, and for cosmology -- back to inflation. | |
Please note the unusual time (we start 15min later than usual) |
18 Jan 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Anatael Cabrera, Paris, France | |
The neutrino discovery (1956), by Reines & Cowan, paved the technical ground behind the establishment of much of today’s neutrino detection. Large instrumented volumes have been achieved via a key (implicit) principle: the impeccable transparency of detector, almost regardless of detection technique.Much of that technology has yielded historical success, including several discoveries and Nobel prizes, such as that of 2015 for the discovery of the Neutrino Oscillation phenomenon leading to an important modification of the Standard Model of Particle Physics. Despite their remarkable success, much of the transparent-based technology is also known to suffer from some key limitations, even after 70 years of maturity towards perfection. The pending challenge is to be to endow detectors with powerful active background rejection while allowing large volume articulation. Indeed, poor particle identification is a long standing issue. This forces experiments to rely on expensive and cumbersome external shield (active or passive), including major overburden in underground laboratories, as the only mean to mitigate otherwise overwhelming backgrounds.
In this seminar, the referent shall introduce the LiquidO technology — in final stages of demonstration — relying, for the first time, heavily on detection medium opacity. The goal is enable sub-atomic particle event-wise imaging, so event topology may be use for particle ID purposes, even in the low MeV region. The development is led by the homonymous LiquidO international academic consortium with institutions over 10 countries. While not perfect, LiquidO appears to be capable to offer several detection features that might lead to breakthrough potential in the context of both neutrino and rare decay physics. The physics potential will be briefly highlighted. Beyond its most basic demonstration, LiquidO remains a testbed context for further detection R&D, where much innovation is expected and ongoing. | |
|
19 Jan 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Giuseppe Vallone, University of Padova, Italy | |
Within the last two decades, Quantum Technologies have made tremendous progress, from proof of principle demonstrations to real life applications, such as Quantum Key Distribution (QKD) and Quantum Random Number Generators (QRNGs). Here, we first briefly review the basic principles of QKD and QRNGs. We then discuss the results that we have recently obtained in our group at the University of Padova towards the realization of ultra-fast and secure QRNGs and mature and efficient QKD systems.
Prof. Giuseppe Vallone is an Associate Professor at University of Padua since 2019 (www.dei.unipd.it/~vallone) and co-founder and CTO of ThinkQuantum (www.thinkquantum.com), a spin-off of the Univeristy of Padua pioneering a new generation of secure communication systems based on quantum technology. His research is focused on quantum information, photonic states, quantum communication, quantum random number generators and Orbital Angular Momentum states. He has three patents and more than 130 publications in the area of quantum optics and quantum information. He is currently the coordinator of the European Project QUANGO (www.quango.eu) and the Italian Project QUASAR (quasar.dei.unipd.it). | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Weixiang Chen, JGU, Chemistry | |
Liquid-liquid phase separation (LLPS) has been identified as a key mechanism regulating the formation of membraneless organelles inside cells. These membraneless organelles, typically composed of DNA, RNA, protein, etc., are involved in many cellular reaction networks by forming micro-sized reactors to locally concentrate specific species or signal molecules, facilitating metabolic reactions, and thus maintaining the functionality of cells. Herein, building on an established model DNA-condensate system, we report an anomalous diffusion process of short oligonucleotide during their uptake by large DNA-condensates driven by specific binding interaction. We show that the interior dynamics of DNA-condensates can be tuned by orders of magnitude at varied salinity, while the diffusional mechanism of signal uptake simultaneously adapts from non-Fickian to Fickian type diffusion. With systematical study on such anomalous diffusion process, we have found pathway to control the velocity of the diffusional process and established a generic mechanism explaining it based on an old polymer physics concept. | |
| at Zoom | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 15:00 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Lorena Baranda, JGU, Chemistry | |
DNA nanotechnology employs synthetic nucleic acid strands to design and engineer nanoscale structural and functional systems of increasing complexity that may find applications in sensing, computing, molecular transport, information processing, and catalysis. Several features make synthetic DNA a particularly appealing and advantageous biomaterial for all the applications mentioned above but more specifically for sensing. First, synthetic DNA sequences, especially if of limited length (<100 nucleotides), have highly predictable interactions and thermodynamics. Second, DNA recently became quite easy and inexpensive to synthesize. Third, DNA contains several functional groups that make it quite straightforward to modify a synthetic nucleotide sequence at both ends or internally. A variety of additional reactive groups can be introduced into DNA sequences. For sensing applications, these functional groups can be used to conjugate signaling moieties (for example, fluorophore/quencher pairs). Importantly, it is also possible to conjugate different recognition elements such as antigens to a synthetic DNA sequence, thus allowing the use of antibodies as targets to be detected with DNA-based sensors. Over my introductory talk, I will present the developed work during my PhD on DNA-based sensors and how I am applying the acquired knowledge in the field of soft colloids and synthetic cells during my postdoctoral research at Prof. Andreas Walther group. | |
| at Zoom | |
|
20 Jan 2023
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:00 Uhr s.t., Newtonraum, 01-122, Staudingerweg 9 |
| Roland Netz, Freie Universität Berlin | |
TBA | |
|
23 Jan 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Johannes Balz, Institut für Physik | |
Search for invisible Higgs-Boson decays with the ATLAS detector | |
| at Zoom | |
|
24 Jan 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Markus Klute, KIT | |
„I think we have it“ – with these words, the then Director General of CERN, Rolf-Dieter Heuer, commented on July 4th, 2012 the detection of a new elementary particle at the Large Hadron Collider (LHC). The search for the Higgs boson, which had lasted almost 50 years, had reached its goal. With the discovery of the Higgs boson, a new era began at the LHC, the precise measurement of the particle's properties. With the help of these properties, conclusions can be drawn about the fundamental structure of the universe and matter. In this colloquium, I will discuss the latest result and prospects in the quest to decipher the Higgs boson. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Quentin Decant, Brussels U. | |
Dark matter (DM) from freeze-in or superWIMP production is well known to imprint non-cold DM signatures on cosmological observables.
It will be discussed how to derive constraints from Lyman-α forest observations for both cases, based on a reinterpretation of the existing Lyman-α limits on thermal warm DM.
Special emphasis is placed on the mixed scenario, where contributions from both freeze-in and superWIMP are similarly important. In this case, the imprint on cosmological observables can deviate significantly from thermal warm DM. The above will be illustrated by studying a coloured t-channel mediator DM model, in which case contributions from both freeze-in through scatterings and decays, as well as superWIMP production can be important. The entire cosmologically viable parameter space, cornered by bounds from Lyman-α observations, the LHC, and Big Bang Nucleosynthesis, will be mapped. | |
|
25 Jan 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Peter von Ballmoos, IRAP, Toulouse, France | |
The tentative detection of a few anti-Helium nuclei [1] is presently revitalising the discussion on the existence of baryonic antimatter in the Universe. As ”the discovery of a single anti-helium nucleus in the cosmic ray flux would definitely point toward the existence of stars and even of entire galaxies made of anti-matter” [2] it has been proposed that the anti-Helium nuclei could originate from anti-clouds or anti-stars in the solar vicinity [3]. We discuss possible entities of antimatter in the Universe that would be probed through ordinary matter, with annihilation-radiation providing indirect evidence for their presence [4]. The observations of high energy (∼ 100 MeV) gamma-rays sets limits on the fraction of nuclear antimatter contained in our local and Galactic neighbourhood. We review recent gamma-ray [5] observations that set upper limits on such emissions.
[1] S. Ting, https://indico.cern.ch/event/729900, (2018)
[2] P.Salati, et al., Nuclear Physics B, 70, 1-3, 492, (1999)
[3] V. Poulin, et al., Phs. Rev. D 99, 023016, (2019)
[4] P. von Ballmoos, Hyperfine Interact. 228, 91,, (2014)
[5] S. Dupourque, et al., Phs. Rev. D 103, 083016, (2021) | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Claus Ropers, MPI for Biophysical Chemistry and University of Göttingen | |
Developments in ultrafast electron microscopy | |
| at Zoom and SPICE YouTube Channel | |
|
26 Jan 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Vahid Sandoghdar, Max-Planck-Institut für die Physik des Lichts, Erlangen | |
Laboratory manipulation of single quantum emitters and single photons has matured to a routine procedure over the past two decades. These activities have led to new emerging topics such as optomechanical functionalities and coherent cooperative interactions among several quantum emitters. In this presentation, I discuss our efforts of the last decade in coupling molecules to high-finesse Fabry-Perot cavities and nanoscopic waveguides on a chip, demonstrating dipole-induced transparency, strong coupling and single-photon nonlinearity. Moreover, I present data on precision spectroscopy of the vibronic transitions in single molecules as well as theoretical conception of hybrid optomechanical platforms for achieving long coherence and storage times. I will also present the latest results on the coupling of two or molecules to each other via a common mode of a micro-resonator. | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 11:30 Uhr s.t., Hörsaal Kernphysik |
| Andrey Milchev, Institute of Physical Chemistry, Bulgarian Academy of Sciences | |
Translocation Dynamics of Vesicles Through Narrow Pores | |
|
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 14:00 Uhr s.t., 01-122 Newton Raum |
| Vincent Cros, Unité Mixte de Physique CNRS, Thales, Univ. Paris-Saclay | |
From 2D skyrmions to 3D cocoons : nucleation, motion and electrical detection of non collinear topogical spin textures
Vincent Cros
Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France.
In the last decade, magnetic multilayers have proven to be essential structures for creating and investigating complex, topologically non-trivial spin textures through the ability to tune their composition and properties [1-2]. Two-dimensional magnetic textures such as skyrmions (or chiral domain walls) were mostly under focus. First, I will share some of our recent results showing the skyrmion nucleation can be precisely controlled using injection of current pulses through artificial notches and show how the spin-orbit torques, responsible for the skyrmion motion, can be optimized in multilayers. More specifically, I will explain how, in atomically thin Co, the SOTs amplitudes, both for damping and field-like symmetries, varies significantly when a light element, such as Al is deposited on top of Co, surpassing the values existing in literature [3]. Then I will describe how the presence and the displacement of skyrmions can be precisely followed through a simple electrical detection. By relying on our ability to perform fully-electrical manipulation and detection of magnetic skyrmions in multilayers, I will present some recent device developments for performing a basic unconventional computation operation in hardware.
Beyond the 2D skyrmions, a strong interest has emerged for more complex magnetic objects which display a non-homogeneous behavior over the vertical dimension, giving them a 3D character e.g. magnetic bobbers [4] or the recently observed hopfions [5]. In the second part of my talk, I will present our recent results on 3D spin textures, called skyrmionic cocoons [6], that have a typical ellipsoidal shape and that can be stabilized in aperiodic magnetic multilayers with a variable thickness for the ferromagnetic elements. Interestingly, these skyrmionics cocoons can coexist with more standard tubular skyrmions going through all the multilayer as evidenced by the existence of two very different contrasts in room temperature magnetic force microscopy. They can also be electrically detected using magneto-transport measurements, an interesting feature for potential applications. The presence of these novel skyrmionic textures as well as the understanding of their layer resolved chiral and topological properties have been investigated by micromagnetic simulations. Finally, I will describe how the use of x-ray holography and x-ray laminography gives a precise insight into the 3D distribution of the magnetization which demonstrate the 3D nature of skyrmionic cocoons.
Financial supports from FLAG-ERA SographMEM (ANR-15-GRFL-0005), from ANR MEDYNA (ANR-20-CE42-0012), from “Investissements d’Avenir" program SPiCY (ANR-10-LABX-0035), from France 2030 government grant (ANR-22-PEPR-Electronique-EMCOM and ANR-23-PEPR-Spin) and the EU Horizon2020 Programme under FET-Proactive Grant agreement No. 824123 (SKYTOP) are acknowledged.
[1] A. Fert, N. Reyren and V. Cros, Nat. Rev. Materials 2, 17031 (2017)
[2] K. Everschor-Sitte et al, J. Appl. Phys. 124, 240901 (2018)
[3] S. Krishnia, VC et al, arXiv:2205.08486 (2022)
[4] F. Zheng et al. Nat. Nanotech., 13, 451 (2018)
[5] N. Kent et al. Nat. Comm. 12, 1 (2021)
[6] M. Grelier, VC et al. Nature Comm, 13, 6843 (2022) | |
|
30 Jan 2023
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 16:00 Uhr s.t., Medien-Raum (03-431) |
| Joo-Von Kim, CNRS, Université Paris-Saclay | |
Resonant dynamics and anomalous thermal diffusion of magnetic skyrmions | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Konstantin Wernli, University of Southern Denmark | |
In the Batalin-Vilkovisky (BV) formalism, one can define a perturbative (i.e. given by Feynman graphs and rules) partition function $Z(x_0)$ for any choice of classical background (solution to Euler-Lagrange (EL) equations) $x_0$. In some examples one can extract from $Z$ a volume form on the smooth part of the moduli space of solutions to EL equations, and compare its integral with non-perturbative approaches to quantization. I will review this construction, some results from examples in the literature and ongoing joint work with P. Mnev about the behaviour at singular points $x_0$. | |
| at Zoom | |
|
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Peter Krämer, Institut für Physik | |
Search for short and long-lived axions in H -> a a -> 4 photons decays with the ATLAS experiment at the LHC | |
| at Zoom | |
|
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 16:00 Uhr s.t., Medien-Raum (03-431) |
| Joo-Von Kim, Centre for Nanoscience and Nanotechnology, CNRS, Université Paris-Saclay | |
Magnetic skyrmions are nanoscale, chiral topological solitons which exhibit a wide variety of interesting dynamical phenomena that have solicited much interest for fundamental reasons and technological applications alike. In this talk, I will discuss some recent experimental and theoretical results on two aspects of skyrmion dynamics in ferromagnetic thin film systems. The first involves the resonant dynamics in multilayered films of [Pt/FeCoB/AlOx]20, which are found to host dense robust skyrmion lattices at room temperature with a relatively low Gilbert damping of ∼0.02 [1]. Broadband ferromagnetic resonance measurements, combined with micromagnetic simulations, reveal distinct resonant modes detected in the skyrmion lattice phase. These are found to involve localised excitations, along with skyrmion core precession emitting spin waves into uniform background with wavelengths in the 50–80 nm range. The second aspect involves thermal diffusion of skyrmions in frustrated systems under spin-orbit torques, where the helicity dynamics leads to an anomalous drift that strongly depends on the strength of the Dzyaloshinskii-Moriya interaction. Such drift processes suggest the importance of helicity coupling to spin-orbit torques and may have bearing on dipole-stabilized bubbles for which drive-dependent skyrmion Hall angles and low drift velocities have been reported. [1] T. Srivastava et al, arXiv:2111.11797 [cond-mat.mes-hall]. | |
|
31 Jan 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Philipp Schmidt-Wellenburg, PSI Switzerland | |
An electric dipole moment (EDM) of a fundamental particle would violate time and parity symmetry and by the virtue of the CPT theorem also the combined symmetry of charge conjugation and parity inversion. Searches for EDM are generally considered highly sensitive probes for new physics and might shed light on still unresolved questions in particle physics and cosmology like the origins of matter, dark matter, and dark energy.
At the Paul Scherrer Institute in Switzerland, we are setting up an experiment searching for a muon EDM with a sensitivity of 3E-21 ecm using, for the first time, the frozen-spin technique~\cite{Farley2004PRL} in a compact storage ring. This will lay the ground work for a second phase with a final precision of better than 6e-23 ecm.
This staged approach to search for a non-zero muon EDM probes previously uncharted territory and tests theories of BSM physics by: i) improving the current direct experimental limit of d < 1.5E-19 ecm (CL 90%) by roughly three orders of magnitude;
ii) being a complementary search for an EDM of a bare lepton;
iii) being a unique test of lepton-flavor symmetries;
and iv) in the case of a null result, will be a stringent limit on an otherwise very poorly constrained Wilson coefficient. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Felix Kahlhöfer, KIT | |
Given our detailed knowledge of the dark matter energy density in the present universe, it is of great interest to study its evolution at early times in order to understand the mechanism of dark matter production. A particularly intriguing scenario, known as freeze-in, is that dark matter particles have tiny couplings and never enter into equilibrium with the thermal bath of Standard Model particles. In this talk, I will discuss various technical challenges that arise in this scenario as a result of the high temperatures and densities in the early universe. Specifically, I will show how to consistently treat the spin statistics of relativistic quantum gases and how to accurately calculate dark matter production via the Higgs resonance. Finally, I will discuss the case of freeze-in with low reheating temperature, which may be testable through cosmological, astrophysical and laboratory observations. | |
|
01 Feb 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| CANCELED: Prof. Dr. Steen Hannestad, Univ. Aarhus, Denmark | |
Neutrino physics in the era of precision cosmology | |
|
02 Feb 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Stephan Schiller, Heinrich-Heine-Universität Düsseldorf, Institut für Experimentalphysik | |
Molecular hydrogen ions (MHI), the simplest molecules, are three-body quantum systems composed of two simple nuclei and one electron. They are of high interest for fundamental physics and metrology because they provide the missing link between the fields of mass and g-factor measurements with Penning traps and spectroscopy of hydrogen-like atoms.
Basically, the new ingredients introduced by the MHI are the long-range nucleus-nucleus interaction, absent in the hydrogen atom, and the quantized motion of the nuclei.
Precision spectroscopy of the MHI can thus furnish novel results: (1) on the masses of proton and deuteron (in the future, also of tritium), (2) set limits for beyond-Standard-Model (BSM) forces, (3) verify the wave character of matter, and (4) test alternative theories of quantum mechanics. This is performed by comparing or matching experimental and theoretical rotational and/or vibrational frequencies. The comparison is enhanced by the availability of several recently measured transition frequencies and recent advances in ab initio theory.
An additional opportunity for probing the interactions between the particles within the MHI is the precision measurement of its hyperfine structure (HFS). Only the synthesis of the HFS of the hydrogen atom, of the deuterium atom and of the molecular hydrogen ion allows probing the physics of HFS
at the finest level, resolving the issue of the uncalculable nuclear contributions.
We present recent results of our spectroscopy of sympathetically cooled MHI, its results and interpretation. An outlook on near-future studies is also given. | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Swapnasopan Datta, JGU, Chemistry | |
Conventional chemistry deals with reactants that lead to stable molecules following a classical equilibration pathway. The same holds for classical self-assembly processes, in which non-covalent interactions lead to assembly according to thermal equilibration. There are also a number of systems that reach a metastable state momentarily, and subsequently jump to another lower energy state. In supramolecular systems, this is called pathway complexity. The propensity to transition from a metastable state to an equilibrium state is a function of the energy barrier with respect to thermal energy. This is fundamentally different from the far-from-equilibrium way living systems work, which can be achieved by employing a ‘fuel’ which drives a system to a high energy state and coupling it with an environment which can bring the system back to the original state. Keys to non-equilibrium behaviour are the mechanisms through which systems are able to extract energy from the chemical reactants (‘fuel’) that drive such processes. In our group, a fuel driven enzyme mediated reaction network was established where a ligation reaction occurs followed by a dynamic steady state, whose lifetime depends on the fuel concentration and dynamics is decided by the ratio of the ligation and restriction enzymes, and finally the restriction process dominates giving back the monomers. This is achieved in our case by using ATP as a fuel which activates a ligation enzyme leading to formation of DNA polymers which get cleaved by the restriction enzyme giving back the monomers. By tuning the interactions between these polymers, one can give rise to multivalent DNA coacervates which phase separate as a function of time and eventually vanish when the restriction step dominates. This liquid liquid phase separation (LLPS) process is fundamentally different from conventional coacervation in that it occurs as a result of interaction between polymers which are at a very high energy as opposed to thermodynamically stable phase separation. In this talk I will talk about trapping such a reaction module inside a ‘protocell’ which is a simple mimic of a real cell and explore the possibility of making a synthetic cell bottom up inside which transient LLPS might occur. For this project, we are using liposomes as cell mimics as the phospholipid bilayer which they contain closely resembles a cell. | |
| at Zoom | |
|
03 Feb 2023
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:00 Uhr s.t., Newtonraum, 01-122, Staudingerweg 9 |
| Jeetain Mittal, Texas A&M | |
TBA | |
|
06 Feb 2023
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., Munich, Theresienstr. 37A, R. 348 |
| Renann Lipinski Jusinskas, Prague | |
In this talk I will present a worldsheet model obtained from "twisting" the target space CFT of conventional string theory. The physical spectrum becomes finite and corresponds to the massless spectrum of closed strings plus a single massive level of the open string. The underlying idea is to explore the field/string theory interface in both directions. On one hand, the goal is to generate effective field theories describing massive higher spins using worldsheet methods. Conversely, we may try to use field theory methods to obtain a systematic description of string scattering amplitudes using field theory methods. | |
| at Zoom | |
|
07 Feb 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Tom Aumann, TU Darmstadt & GSI Darmstadt | |
Reactions with short-lived nuclei are key to understand the properties of neutron-rich nuclei and neutron-rich nuclear matter. In recent years, quasi-free scattering experiments have been developed and established for experiments with radioactive beams at GSI and RIKEN. The inverse kinematics of the reaction opens thereby the possibility for a complete characterisation of the final state, which results in an almost background-free measurement. Recent results with stable and radioactive beams will be discussed including the first measurement of short-range correlations in inverse kinematics, the observation of alpha clusters at the surface of heavy nuclei, as well as the observation of a correlated four-neutron state. The perspective for a precise determination of the neutron-neutron scattering length using the 6He(p,p alpha)2n reaction will be discussed as well. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Weiguang Jiang, JGU Mainz | |
Nuclear saturation is a key property of low-energy nuclear physics that depends on the fine details of the nuclear interaction. We develop a unified statistical framework that uses realistic nuclear forces to link the theoretical modeling of finite nuclei and infinite nuclear matter. We also construct fast and accurate emulators for nuclear-matter observables and employ an iterative history-matching approach to explore and reduce the enormous parameter domain of Delta-full chiral interactions. | |
|
08 Feb 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Julien Lesgourgues, Aachen | |
Cosmologists are puzzled by a tension between the results of two categories of observations, which has been growing over the past few years. This “Hubble tension” arises from contradictory indications concerning the current expansion rate of the universe. The referent will try to give a pedagogical overview of this problem, with a summary of the physical assumptions that go into the interpretation of each observation. Then, assuming that the tension persists with future data releases, he will give examples of the kind of new fundamental physics that could help solving it. Slides here... | |
|
09 Feb 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Immanuel Bloch, Max-Planck-Institute of Quantum Physics, Garching | |
Quantum Simulations using Ultracold Atoms in Optical Lattices 40 years ago, Richard Feynman outlined his vision of a quantum simulator for carrying out complex calculations of physical problems. Today, his dream has become a reality and a highly active field of resarch across different platforms ranging from ultracold atoms and ions, to superconducting qubits and photons. In my lecture, I will outline how ultracold atoms in optical lattices started this vibrant and interdisciplinary research field 20 years ago and now allow probing quantum phases in- and out-of-equilibrium with fundamentally new tools and single particle resolution. In addition, I will show how fundamentally new avenues of controlling light-matter interactions can be realized based on the rich interplay of photon-mediated dipole-dipole interactions in structured subwavelength arrays of quantum emitters. In the experiments, we directly observe the cooperative subradiant response of such an ordered array of ultracold atoms. Through spatially resolved spectroscopic measurements, our experiments show that the array acts as an efficient mirror formed by only a single monolayer of a few hundred atoms. Finally, I will discuss latest experiments, where the optical properties of the entire array can be switched via a single Rydberg impurity that is deterministically prepared in the center of the array. This opens the path towards novel structured quantum light matter interfaces with unique properties in free space. | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 15:00 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7, |
| Roberto Covino, Frankfurt Institute for Advanced Studies | |
Molecular self-organization driven by concerted many-body interactions produces the ordered structures that define both inanimate and living matter. Understanding the physical mechanisms that govern the formation of molecular complexes is key to controlling the assembly of nanomachines and new materials.
Molecular dynamics simulations and single-molecule experiments offer the unprecedented possibility to reveal mechanisms of molecular self-organization in high resolution. However, outstanding limitations hinder their success. Machine learning and artificial intelligence promise to empower both approaches to overcome fundamental challenges.
In the first part of my talk, I will present an autonomous AI that learns molecular mechanisms from computer simulations. The AI agent simulates infrequent and stochastic molecular reorganizations and progressively learns how to predict their outcome. Using symbolic regression, we distill simplified quantitative models that reveal mechanistic insight in a human-understandable form. Our innovative AI enables sampling rare events by autonomously driving many parallel simulations with minimal human intervention and aids their mechanistic interpretation. I will present applications on nucleation processes, the assembly of membrane proteins in lipid bilayers, and polymer and protein folding.
In the second part of my talk, I will discuss how integrating physical modeling and AI helps extract mechanistic understanding from single-molecule force spectroscopy. While these experiments offer the possibility of measuring fundamental quantities like free energies, these measurements are often incomplete and indirect. In practice, we measure a few order parameters that are the outcome of the coupled dynamics of the molecule and the mesoscopic experimental apparatus, which could lead to estimation artifacts. I will discuss this problem as Bayesian inference and illustrate how simulation-based inference provides a powerful solution. Coupling a simulator that encodes the physics of the measuring process with density estimation using neural networks leads to accurate estimates of molecular free energies.
In conclusion, integrating physics-based models and AI provides a powerful way to extract accurate quantitative information from simulations and biophysical experiments. | |
|
15 Feb 2023
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Alberta Bonanni, Johannes Kepler University | |
A stride down the quantum materials roadmap | |
| at Zoom and SPICE YouTube Channel | |
|
22 Feb 2023
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Angela Wittmann, JGU | |
Exploring spintronics at unconventional hybrid interfaces | |
| at Zoom and SPICE YouTube Channel | |
|
16 Mar 2023
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 14:00 Uhr s.t., 01-122 Newton Raum |
| Masahiro Yamashita, Department of Chemistry, Faculty of Science, Tohoku University, Sendai, Japan | |
Spintronics, based on the freedoms of charge and spin of the electron, is a key technology in the 21st century. Magnetic random access memory (MRAM), which uses giant magnetoresistance (GMR), has several advantages compared with electronics. Although conventional magnets composed of transition metals are normally used, in our study, we use molecule-based nano-magnets and single-molecule magnets (SMMs) to overcome “Moore`s Limitation”. SMMs are also available for quantum computer. I will talk about the molecular spin qubits for quantum computer ([1]Crystal Engineering Method, [2]g-Tensor Engineering Method, [3]Orbital Engineering Method, and [4]Molecular Technology Method) as well as high-density memory devices such as single-molecule memory device, SMMs encapsulated into SWCNT, and metallic conducting SMMs with negative magnetoresistances. | |
|
17 Apr 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Dennis Layh, Institut für Physik | |
MEDUSA and CALONet High-Speed Data Transmission and a Deep Learning-based Algorithm for an Upgrade of the ATLAS Trigger | |
| at Zoom | |
|
18 Apr 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Masaki Hori, JGU Institute for Physics | |
Metastable antiprotonic helium is an exotic atom composed of a helium nucleus, electron, and an antiproton. It is among the hadron-antihadron systems with the longest known lifetimes. Laser light can be used to excite atomic transitions involving the antiproton orbital. By utilizing sub-Doppler two-photon laser spectroscopy and buffer gas cooling, its atomic transition frequencies were measured to ppb-scale precision. Comparisons with the results of QED calculations allowed the antiproton-to-electron mass ratio to be determined as 1836.1526734(15). The results were used to set upper limits on fifth forces between antiprotons and nucleons at atomic length scales, and on forces that may arise between an electron and antiproton mediated by hypothetical bosons. Efforts are currently underway to improve the experimental precision using CERN’s ELENA facility. We also observed narrow spectral lines of these atoms formed in superfluid helium with a surprisingly high spectral resolution of 2 parts per million. This revealed the hyperfine structure arising from the spin interaction between the antiproton and electron, despite the atom being surrounded by a dense matrix of normal atoms.
Metastable pionic helium (πHe+) contains a negative pion occupying a state of n≈l-1≈17, and retains a 7 ns average lifetime. We recently used the 590 MeV ring cyclotron facility of Paul Scherrer Institute to synthesize the atoms, and irradiated them with infrared laser pulses. This induced a pionic transition within the atom and the π- being absorbed into the helium nucleus. This constitutes the first laser excitation and spectroscopy of an atom containing a meson. By improving the experimental precision, the pion mass may be determined to a high precision as in the antiproton case. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Anna Socha, Warsaw U. | |
According to the standard model of cosmology, the Universe at its very beginning underwent a phase of rapid expansion, followed by a reheating period. During this epoch, the energy density, initially accumulated in the coherent oscillations of the inflaton field, was injected into the visible sector, eventually setting the initial conditions for the hot Big Bang. In this talk, I will discuss perturbative production of the Standard Model (SM) particles adopting a non-standard post-inflationary scenario with a generic equation-of-state parameter \(\bar{w}\). To specify the inflaton dynamics, I will employ the \(\alpha\)-attractor T-model of inflation, such that \(\phi\) has a monomial potential \(V(\phi) \propto \phi^{2n}\) about the minimum. Moreover, I will explore the Higgs boson-induced reheating, assuming that it is achieved through a cubic inflaton-Higgs coupling \(\phi |\mathcal{H}|^2\). In the presence of such interaction, the Higgs field acquires a \(\phi\)-dependent mass which generates a vacuum expectation value that oscillates in time and breaks the electroweak gauge symmetry. Interestingly, the non-zero Higgs mass leads to a time-dependent inflaton decay rate and generates a phase-space suppression of the reheating efficiency. This, in turn, has non-trivial consequences for the reheating dynamics, modifying the evolution of the SM radiation energy density or the duration of the reheating phase. Furthermore, the implications of the non-standard reheating for the dark sector will be discussed, exemplified by the UV freeze-in dark matter model. | |
|
19 Apr 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Sebastian Ellis, Geneva University, Switzerland | |
Current and future Gravitational Wave (GW) observatories target the nHz to kHz frequency range. However, phenomena both within and beyond the Standard Model can give rise to GW signals above kHz. We will briefly discuss what these signals could be, before focusing on promising techniques to search for high-frequency GWs using resonant electromagnetic cavities. The technologies that have been developed to search for axion dark matter are directly transferrable to a search for GWs. Concurrent GW/axion searches are an exciting possibility. Slides here... | |
|
20 Apr 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Dr. Fernando Lemini, ICTP (Intl. Center for Theoretical Physics), Trieste, Italy | |
I discuss the concept of boundary time crystals, where the continuous time-translation symmetry breaking occurs only in a macroscopic fraction of a many-body quantum system. After introducing its definition and properties, we discuss in detail a solvable model where an accurate scaling analysis can be performed. The existence of the boundary time crystals is intimately connected to the emergence of a time-periodic steady state in the thermodynamic limit of a many-body open quantum system. I will also discuss the spreading of genuine multipartite correlations (GMC's) on such phases, showing results both for the (i) the structure (orders) of GMC's among its subsystem constituents, as well as (ii) their build-up dynamics for an initially uncorrelated state. | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Yuqing Wang, JGU, Chemistry | |
Printing of biologically functional constructs is significant for applications in tissue engineering and regenerative medicine. However, the development of bio-ink, a printable cell-laden material, remains a major challenge due to its multifaceted demands. While printability is highly dependent on the physical properties of the material, the formation of functional tissues requires interactions between the cells and the extracellular matrix.
In this work, a balance between the physical processability and cytocompatibility is achieved by using a supramolecular approach. Therefore, one supramolecular network which shows fast stress relaxation and supports cell proliferation is mixed with a second physical network that can be transformed into a chemical network by applying an external photo trigger. The interpenetrating networks obtained have improved shape fidelity while the cytocompatibility is maintained. | |
| at Zoom | |
|
24 Apr 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Savitri Gallego, Institut für Physik | |
From short baseline reactor neutrino experiment to gamma-ray astrophysics | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Ed Segal, University College London | |
Given a Hamiltonian torus action on a symplectic manifold, Fukaya and Teleman tell us that we can relate the equivariant Fukaya category to the Fukaya category of a symplectic reduction. Yanki Lekili and I have some conjectures that extend this story - in certain special examples - to singular values of the moment map.
I'll also explain the mirror symmetry picture that we use to support our conjectures, and how we interpret our claims in Teleman's framework of `topological group actions' on categories. | |
| at Zoom | |
|
25 Apr 2023
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| PRELIMINARY DISCUSSION, Institut fuer Physik | |
VORBESPRECHUNG | |
|
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Gaute Hagen, Oak Ridge National Lab. Knoxville - USA | |
High performance computing, many-body methods with polynomial scaling, and ideas from effective-field-theory is pushing the frontier of ab-initio computations of nuclei.
Here I report on advances in coupled-cluster computations of nuclei starting from chiral Hamiltonians with two- and three-nucleon forces. The ab-initio approach can now be used to address fundamental questions related to the nature of the neutrino by accurate computations of neutrino-less double beta decay and making first steps towards neutrino-nucleus scattering on relevant nuclei. Global surveys of bulk properties of medium-mass and neutron- rich nuclei from ab-initio approaches are now possible by using reference states that break rotational symmetry. These calculations have revealed systematic trends of charge radii in various isotopic chains, questioned the existence of certain magic shell closures in neutron-rich nuclei, and confrontation with data have exposed challenges for ab- initio theory. By restoring rotational symmetry, we have made predictions for the rotational structure of neutron-rich neon isotopes including 32,34Ne.
In addition to entire regions of the nuclear chart now being targeted by ab-initio computations, entirely new ways to make quantified predictions are becoming possible by the development of accurate emulators of ab-initio calculations. These emulators reduce the computational cost by many orders of magnitude allowing for billions of simulations of nuclei using modest computing resources. This allows us to perform global sensitivity analysis, quantify uncertainties, and use novel statistical tools in predicting properties of nuclei. Recently we used these tools to make a quantified prediction of the neutron skin in 208Pb, and found that the neutron-skin is smaller and more precise than a recent extraction from parity-violating electron scattering but in agreement with other experimental probes. We have also used these tools to address the questions of what drives deformation in atomic nuclei and whether 28O is a bound nucleus. These developments demonstrate how realistic two- and three-nucleon forces act in atomic nuclei and allow us to make quantitative predictions across the nuclear landscape. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Fabrizio Rompineve, CERN | |
A population of relativistic QCD axions can be produced in the early Universe, via scatterings with Standard Model particles. This can be searched for in cosmological datasets, which therefore provide the opportunity to discover/constrain the QCD axion, independently of astrophysical and/or laboratory probes.
In this talk, after reviewing the subject, I present an improved calculation of the relic abundance of such “hot” axions from scatterings with pions below the QCD crossover, as well as the resulting upper bound on the QCD axion mass. I then discuss the exciting outlook of upcoming cosmological surveys, which may probe otherwise unexplored regions of the QCD axion parameter space. I highlight the need of a non-perturbative calculation of axion production rates throughout the QCD crossover, to fully exploit the reach of such datasets. | |
|
26 Apr 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Ryan Mitchell, Indiana University, USA | |
Using the idea of a field guide as a template, the referent will briefly review the rapidly expanding catalog of known mesons, which are strongly interacting subatomic particles made from equal numbers of quarks and antiquarks. While most mesons can be successfully described as one quark bound to one antiquark, recent discoveries point towards the existence of new meson families. These discoveries, made at experiments such as the BESIII e+e- experiment in Beijing and the LHCb pp experiment at the LHC, offer new contexts in which to study the strong force of particle physics. Slides here... | |
|
27 Apr 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Dr. Jack A. Devlin, Imperial College, London, UK | |
The toolkit of quantum technologies developed in atomic, molecular and optical physics are ideally suited to enhance the search for dark matter axions with masses above ~40 µeV. I will present an overview of a new experimental effort under construction at Imperial College, developing technologies to detect DFSZ axions with masses 120-250 µeV. We plan to use a large mode area Fabry-Perot cavity to efficiently convert axions into microwave photons. Compared to other geometries, the Fabry-Perot cavity can present a large mode volume and high Q, and can be easily tuned. To detect the microwaves, we will use an electron in a Penning trap as a single photon counter. Individual microwave absorption events will change the cyclotron state of the electron, causing measurable shifts in the trapped particle’s oscillation frequencies. This versatile device will also open other possible detection routes for alternative dark matter candidates and cosmological phenomena. | |
|
02 May 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Peter Zoller, University of Innsbruck and IQOQI - Austria | |
The development of atomic quantum simulation platforms has led to the creation of a new generation of programmable quantum simulators that can be scaled to large particle numbers while maintaining a certain degree of programmability.
This talk reports on theory-experiment collaborative work using trapped ion platforms with up to fifty-one qubits/spins, where we develop and demonstrate quantum protocols that can address questions ranging from fundamental to practical.
Examples include first observation of area law vs. volume law entanglement in ground and excited states of many-body systems, and quantum simulators acting as programable quantum sensors implementing near “optimal” entanglement-enhanced quantum metrology. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Jose Zurita, IFIC Valencia | |
In the last years there has been a renewed interest in the particle physics theoretical and experimental communities on the study of exotic (non-standard) signatures at colliders, including Long-Lived Particles (LLPs).
In this talk I will first give a brief overview of the theoretical motivations for long-lived particles. Later I will illustrate the impact of LLPs in the current LHC physics programme, including new LHC detectors specifically hunting for LLPs (MoEDAL, FASER, SND@LHC), detector proposals under consideration (MATHUSLA, ANUBIS, FPF) and relevant upgrades to the ATLAS, CMS and LHCb experiments. Finally, I will present snapshots of novel signatures and the implications of LLP searches in the context of neutrino, axion, dark matter and Higgs physics. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
|
03 May 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Ida Zadeh, JGU Mainz | |
A conformal field theory is a physical theory which is invariant under changes in its length or energy scale. It describes the physics of boiling of water. In this talk, the referent will present how conformal field theory is used as a powerful tool to study quantum gravity. She will discuss how conformal field theories describe quantum properties of a family of black holes, just as quantum mechanics describes the Hydrogen atom. Slides here... | |
|
04 May 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Artur Widera, TU Kaiserslautern | |
Excellent experimental control over quantum systems is increasingly bringing applications in quan-tum technologies within reach. In my talk, I will present our work on quantum technology applica-tions in various physical systems.
Ultracold atoms have proven to be excellent platforms for studying quantum effects. In recent years, we have succeeded in introducing single Cs atoms as controlled impurities in an ultracold gas of Rb atoms. Spin-exchange collisions allow a very controlled transfer of energy quanta, and we use this transfer to operate the single atom as a machine in a magnetic field gradient. In another exper-imental setup, we address whether the significant energy differences resulting from the Pauli prin-ciple between ensembles of different fermionic and bosonic quantum statistics can be used as a novel form of energy to drive a quantum machine.
Finally, I will present two new projects in the field of quantum technology. First, we are studying nanocrystals of diamond with a large number of NV centers in terms of collective effects and track-ing how the typical signatures in fluorescence lifetime and photon statistics change when larger agglomerates of nanocrystals show the transition to a bulk-like material.
Second, I report on a new BMBF collaborative project, the quantum computing demonstrator pro-ject Rymax, which will simulate optimization problems from logistics and industry expressed as gra-phene problems on an array of single Yb atoms with Rydberg excitations. | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Franziska Lissel, Leibniz Institute of Polymer Research, Dresden | |
Triblock Copolymers – Using Nanophase Separation to Achieve Low Modulus, Elastic Deformation and Good Mobility in Polymer Semiconductors | |
| at Zoom | |
|
08 May 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Annika Hollnagel, Institut für Physik | |
Search for Hidden Particles: SHiP @ECN3 | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Pyry Kuusela, JGU Mainz | |
Supersymmetic flux vacua in Calabi-Yau compactifications are closely related to intricate number theoretic properties of the compactification manifolds. Such relations are of interest to physicists and number theorists alike: On one hand these can be used to find new, interesting flux vacuum solutions and relate physical quantities to well-studied number theoretic functions. On the other hand, physical intuition allows one to give examples of interesting number theoretic relations and obtain evidence for various conjectures.
To study these relations, we present a novel method, based on symmetries of the compactification manifold, for constructing many large families of number theoretically interesting supersymmetric flux vacua. We show that the zeta functions of the compactification manifolds factorise, as expected by the celebrated modularity conjectures. The coefficients appearing in these factorisations can be associated to elliptic curves which appear in various contexts: For instance, we argue that the value of the axiodilaton field associated to the flux vacua can be identified with the modulus of these elliptic curves. We also obtain extensive evidence for the flux vacuum modularity conjecture proposed recently by Kachru, Nally, and Yang.
This talk is based on arXiv:2302.03047 with Candelas, de la Ossa, and McGovern. | |
| at Zoom | |
|
09 May 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Szymon Pustelny, University of Krakau | |
Thanks to its strong immunity to environmental perturbations, for many decades, molecular nuclear systems have found extensive applications in science, technology, and medicine. One of the techniques exploring these nuclear-spin systems is the technique of nuclear magnetic resonance (NMR). While typically performed under very strong magnetic fields (>1 T), recent advances in hyperpolarization methods and magnetometric techniques have led to the emergence of a technique of zero- and ultralow-field (ZULF) NMR. Operation under such unique conditions, with simple, small, and cost-efficient experimental systems, has opened up new avenues for ultraprecise spectroscopy and relaxometry, allowing for interesting applications in chemistry and biology. In physics, ZULF NMR was used for the engineering of long-lived (tens of seconds) nuclear states and the searches for physics beyond the Standard Model. Despite these applications, however, the technique is still at its early stage and many applications will be developed in future.
During the colloquium, the fundamentals and distinctive features of ZULF NMR will be presented and some of its applications will be highlighted. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
|
10 May 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Giovanni de Lellis, Naples University, Italy | |
SND@LHC is a compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in a hitherto unexplored pseudo-rapidity region of 7.2 < 𝜂 < 8.4, complementary to all the other experiments at the LHC. The experiment is located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on an 800 kg target mass of tungsten plates, interleaved with emulsion and electronic trackers, followed downstream by a calorimeter and a muon system. The configuration allows efficiently distinguishing between all three neutrino flavours, opening a unique opportunity to probe physics of heavy flavour production at the LHC in the region that is not accessible to ATLAS, CMS and LHCb. This region is of particular interest also for future circular colliders and for predictions of very high-energy atmospheric neutrinos. The detector concept is also well suited to searching for Feebly Interacting Particles via signatures of scattering in the detector target. The first phase aims at operating the detector throughout LHC Run 3 to collect a total of 250 fb−1. The experiment has been taking data successfully during the proton physics run of 2022. We show the detector concept, design and performance as well as the first physics results. Slides here... | |
|
15 May 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Patrick Deucher, Institut Für Physik | |
Plastic Scintillator Development in Mainz | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Clay Córdova, University of Chicago | |
We elucidate the fate of classical symmetries which suffer from abelian
Adler-Bell-Jackiw anomalies. Instead of being completely destroyed,
these symmetries survive as non-invertible topological global symmetry
defects with worldvolume anyon degrees of freedom that couple to the
bulk through a magnetic one-form global symmetry as in the fractional
hall effect. These non-invertible chiral symmetries imply selection
rules on correlation functions and arise in familiar models of massless
quantum electrodynamics and models of axions (as well as their non-
abelian generalizations) | |
| at Zoom | |
|
16 May 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Rebecca Surman, University of Notre Dame, Indiana USA | |
The groundbreaking discovery of the neutron star merger event GW170817 ushered in a new era of multimessenger astrophysics. One key observation was the optical signal that accompanied GW170817, which provided the first firm proof that neutron star mergers produce heavy elements. Still, it is not known exactly which elements are produced by mergers and in what proportions. Are neutron star mergers the sole astrophysical source of the heaviest elements or do other extreme events contribute? A full understanding of neutron star mergers and their role in galactic chemical evolution requires progress in a number of areas including nuclear physics. Thousands of exotic nuclear species participate in neutron star merger nucleosynthesis, and their properties shape abundance patterns and kilonova signals. Here we discuss how nuclear physics uncertainties influence predictions of nucleosynthesis observables. We then explore the promise of experimental campaigns at rare isotope beam facilities to both reduce these uncertainties and provide insight into astrophysical environments of heavy element production. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Anne Spiering, Bohr Inst | |
The direct integration of Feynman integrals can be a daunting task, in particular for increasing numbers of loops and external particles. The “symbol bootstrap” has proven to be a powerful tool in the calculation of certain polylogarithmic Feynman integrals and scattering amplitudes that bypasses this direct integration. In this approach one first writes an ansatz for the symbol of the integral and then fixes its degrees of freedom by imposing known mathematical and physical properties of the final result. In this talk I will discuss a generalisation of this approach to an elliptic case: the 12-point two-loop double-box integral. The bootstrapping ansatz is obtained from an elliptic generalisation of the so-called Schubert problem, and after imposing a sufficient number of constraints on this ansatz, we obtain a compact one-line formula for the (2,2)-coproduct of the double-box integral. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
|
17 May 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Vera Gülpers, University of Edinburgh | |
Indirect high-precision searches for possible deviations from Standard Model predictions at low energies are an important tool for finding signatures of new physics. Ab-initio theoretical predictions involving the strong nuclear force at small energies are only possible using Monte Carlo methods in a numerical approach known as Lattice QCD. In recent years lattice calculations of several quantities, such as the pion decay constant, have reached a precision of O(1%), where electromagnetic effects can no longer be neglected. In this talk Vera Gülpers will discuss how electromagnetic effects can be included in lattice calculations and present results of our recent calculation of electromagnetic corrections to leptonic pion and kaon decays. Slides here... | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 18:00 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7, |
| Bernhard von Vacano, BASF | |
PW 059721 | |
https://trr146.uni-mainz.de/activities/ |
22 May 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Mathias Schott, Institut für Physik | |
High Precision Measurement of the Strong Coupling Constant | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 11:00 Uhr s.t., None |
| Kantaro Ohmori, Tokyo | |
The common statement that any consistent quantum gravity theory contains dynamical objects with all possible charges suggests that there are still a number of hitherto-unidentified branes in string theory. Such charges are classified by the bordism classes in the working EFT. In this talk I will describe some of those charges and then discuss plausible worldsheet descriptions of strings near the corresponding branes. | |
| at Zoom | |
|
23 May 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Frank Cichos, University of Leipzig | |
Plasmonics is commonly used to confine electromagnetic waves into subwavelength noble metal structures for photonic applications. As an unwanted side effect, heat is generated locally, which is the foundation of thermoplasmonics. Besides numerous very interdisciplinary applications, such local heat generation provides unique dynamic control over microscopic objects in liquids with non-equilibrium physics. I will give two examples.
First, I discuss experiments on active colloidal particles that are self-propelled by thermoplasmonic effects. Such active particles mimic the motility of living species like bacteria but lack the feedback loops that control their behavior. The optical control of plasmonic heating allows us to implement feedback loops, behavior and even learning for active particles. Using this technique, we can show that perception-reaction delays as omnipresent in living systems can be the origin of a variety of dynamical collective states that even display signatures of criticality.
In a second example, I will briefly report on experiments using plasmonic heat generation to enable the control of liquids and macromolecules. Dynamic temperature fields thereby help us to study elementary processes of peptide aggregation as relevant for neurodegenerative diseases over extremely long periods of time. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Felipe Llanes Estrada, Madrid U. | |
The Electroweak Symmetry Breaking Sector of the Standard Model is an active field where new physics is sought. In the absence of new higher-energy particles at colliders, Effective Field Theories in terms of the Standard Model particles (longitudinal gauge
and Higgs bosons) seem a natural tool. New physics could then manifest itself as new forces modifying the couplings of those particles.
Should such new forces be found, they could be used to confront (falsify?) the popular SMEFT: as it is not the most general possible EFT, we have managed to produce correlations among the parameters of the embedding HEFT that can be tested if that new physics is describable by SMEFT. We have also extended HEFT via the Inverse Amplitude Method to be able to address resonances in the electroweak sector directly from the low-energy particles and eventual BSM couplings, thus maintaining agnosticism about the nature of the eventual new physics,
and I will discuss the systematic uncertainties of the unitarization procedure.
Based on various works, e.g.
https://inspirehep.net/literature/2120028 https://inspirehep.net/literature/2154526
https://inspirehep.net/literature/1826204 https://inspirehep.net/literature/1345172
https://inspirehep.net/literature/1310013 | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Anna Liedtke, Institute of Physics | |
Spin-Orbit Torques in the van-der Waals materials Fe3GeTe2 and Fe3-xCoxGeTe2 | |
|
24 May 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Mikhail Shaposhnikov, EPF Lausanne, Switzerland | |
The referent will overview the problem of baryon asymmetry of the Universe and the theoretical framework within which the baryogenesis, i.e. the dynamical generation of a matter–antimatter asymmetry, can occur. He will discuss different mechanisms for baryogenesis with special emphasis to those of them that can be experimentally tested. Slides here... | |
|
25 May 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Enno Giese, TU Darmstadt | |
Light pulses are an excellent tool to manipulate atoms, so that they move in superposition of different trajectories through space and time. In analogy to the concept of an optical interferometer, these branches can be brought to interference and used as sensors for gravity and other inertial forces. As such, atom interferometry has become a versatile tool technique high-precision quantum metrology, which ranges from gyroscopes to gravitational wave detection, as well as a testbed for the interface of relativity and quantum mechanics.
At the same time, atoms not only possess a center-of-mass motion, but also internal degrees of freedom that are the very basis for atomic clocks. Making use of this additional property, one can in principle generate atomic clocks that move in superposition of different branches, interfere with each other, and therefore constitute a different probe of relativistic effects linked to time.
This colloquium gives an introduction into the main concepts of atom interferometry and the toolbox necessary to manipulate atoms. While we explain basic examples of atom interferometers and state-of-the-art experiments, we also discuss current and ambitious proposals for high-precision tests of fundamental physics. | |
|
30 May 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Angela Wittmann, JGU Institute for Physics | |
Controlled manipulation of a system allows for systematic investigation of the underlying interactions and phenomena. Simultaneously, tunability also enables the development of novel materials systems and devices customized for specific applications. Here, we will focus on materials systems that conventionally have not been used as active components in spintronic devices. We will explore the impact of strain on the antiferromagnetic domain structure via magneto-elastic coupling1. Furthermore, we will delve into hybrid molecule-magnetic interfaces. Molecules offer a unique way of controlling and varying the structure at the interface making it possible to precisely tune the spin injection and diffusion by molecular design2. In particular, chirality has gained recent interest in the context of the chiral-induced spin selectivity effect3. Here, we will explore signatures of spin filtering at a non-magnetic chiral molecule-metal interface paving the path toward novel hybrid spintronics. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Christian Ecker, Frankfurt U. | |
According to the inflationary theory of cosmology, most elementary particles in the current universe were created during a period of reheating after inflation. In this talk I will show how to self-consistently couple the Einstein-inflaton equations to a strongly coupled quantum field theory (QFT) that is described by holography. I will then use a specific example to demonstrate that this setup leads to an inflating universe, a reheating phase and finally a universe dominated by the QFT in thermal equilibrium.
This talk is based on arXiv:2302.06618. | |
|
31 May 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Robert Wilson, Colorado State University, USA | |
Forty years ago as an undergraduate contemplating graduate school in high energy physics, the referent declined a research assistantship to work on a neutrino experiment because neutrinos weren’t interesting … they were massless and weakly interacting so produced frustratingly few events to analyze even in massive detectors. How things have changed! The more we learn, the more we realize the importance of the most abundant known matter particle in the universe. In the decades since my naïve snubbing of this intriguing particle we have developed a well-established three-flavor paradigm that may help explain the matter-antimatter asymmetry of the universe. Yet beyond that, a few intriguing measurement “anomalies” hint at the existence of something stranger still, a neutrino that does not interact via any known forces except gravity, a sterile neutrino.
Robert Wilson will give a brief overview of the results that motivated a definitive search for sterile neutrinos with a mass in the 1 eV/c2 range – the Short-Baseline Neutrino program at Fermi National Accelerator Laboratory. He will describe the physics sensitivity and the detectors that will measure the appearance of electron-type neutrinos in a muon-type neutrino beam using massive liquid argon time-projection chambers with an emphasis on the 760-ton far detector developed by the ICARUS collaboration. Operating both in Italy’s Gran Sasso underground laboratory and now at Fermilab, this detector demonstrated the viability of the technology for large-scale experiments such as the international Deep Underground Neutrino Experiment (DUNE). | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 16:00 Uhr s.t., KpH lecture room, 00-200, Johann-Joachim-Becher-Weg 45 |
| Nico Bischoff, R+V | |
Hybrid event; PW: 359038 | |
PW: 359038 |
01 Jun 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Matthew Baker, Maastricht University | |
TBA | |
| at Zoom | |
|
06 Jun 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Susan Gardner, University of Kentucky - USA | |
Questions that drive searches for physics beyond the Standard Model
include the physical origin of the cosmic baryon asymmetry and of dark
matter. Quark dynamics, as realized through the theory of
quantum chromodynamics (QCD), can appear in these
studies in very different ways. In this talk, I develop these
possibilities explicitly, first describing the role of QCD in
ultra-sensitive searches for new physics, particularly at low energies,
and then turning to how its features could be exploited in describing
the undiscovered universe, along with the essential observational and
experimental tests that could confirm them. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Bibhushan Shakya, DESY | |
The Standard Model Higgs becomes tachyonic at high energy scales according to current measurements. This unstable regime of the Higgs potential can be realized in the early Universe during high scale inflation, potentially with catastrophic consequences. In this talk, we will discuss a crucial inherent feature of such configurations that has so far remained ignored: Higgs particle production out of vacuum induced by the rapidly evolving Higgs field, which gets exponentially enhanced due to the tachyonic instability. We will discuss various theoretical and observational implications of this effect. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Dr. Olena Fedchenko, Institut für Physik / KOMET 5 | |
Investigation of phase-transition in Mo1-x Wx Te2 using ToF-MY | |
|
07 Jun 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Alexander Gerbershagen, University of Groningen, Netherlands | |
The presentation covers the aspects of the use the accelerators for the hadron therapy. It includes the summary of the advantages of hadron use for radiation treatment of cancer, the technological solutions used for the beam acceleration, dose delivery and application, and an overview over the types of commercially available systems. Following that, the presentation concludes by describing the newly established the PARticle Therapy REsearch Center (PARTREC) in Groningen. Using the superconducting cyclotron AGOR and being embedded within the University Medical Center Groningen, providing proton beams of up to 190 MeV and ion beams (up to Pb) with energies up to 90 MeV/nucleon for pre-clinical research in medical physics and radiobiology. Slides here... | |
|
12 Jun 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Tim Schneemann, Institut für Physik | |
SUPAX - A Superconducting Axion Search Experiment | |
| at Zoom | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Medienraum (IPH, 03-431) |
| Apratim Chatterji, IISER-Pune, Pune | |
I shall present our recent results where we modify internal-topology of ring polymers (bead-spring model) to obtain localization of polymer segments within cylindrical confinement. We tried out a variety of topologies to establish the entropic principles which lead to localization of polymer segments. Two polymers in a mixed state under cylindrical confinement undergo segregation, and again topology plays an important part in determining the forces which lead to segregation and subsequent localization. We have used this understanding to predict the localization of loci (polymer segments) of bacterial DNA polymers, as the chromosome is replicating and segregating. It is known that some simple bacterial cells do not have the required machinery to separate their chromosomes within the cell. We have matched out model simulations results for two different bacterial chromosomes, moreover, our model simulation match data from two different experimental techniques ( HiC and FISH) which are complementary in spirit. I am extending our topology driven organization understanding in a variety of scenarios, some of which will be useful to understand more complex organization of chromosomes within more complex cells as well in more complex scenarios of multifork replication within the bacterial cell. | |
|
13 Jun 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Frank Stefani, Helmholz-Zentrum Dresden-Rossendorf | |
Magnetic fields of planets, stars and galaxies are generated by the homogeneous dynamo effect, or self-excitation, in moving electrically conducting fluids, such as liquid metals or plasmas. Once generated, magnetic fields can promote cosmic structure formation by destabilizing, via the magnetorotational instability (MRI), rotational flows that would be otherwise hydrodynamically stable. Closely related instabilities, such as the current-driven Tayler instability might be at work in the solar tachocline.
For a long time, these topics had been the subject of purely theoretical and numerical research. This situation changed in 1999 when the threshold of magnetic-field self-excitation was exceeded in the two liquid sodium experiments in Riga and Karlsruhe. Since 2006, the VKS dynamo experiment in Cadarache has successfully reproduced many features of geophysical interest such as reversals and excursions. MRI related experiments were partly successful with the observation of the helical MRI and the azimuthal MRI at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), where first evidence of the current-driven Tayler instability in a liquid metal was obtained, too. In another liquid metal experiment at the Dresden High Magnetic Field laboratory (HLD) the “magic point” of coinciding Alfvén and sound speeds was reached, which is thought to play a key role for the heating of the solar corona.
The lecture gives an overview about previous and future liquid metal experiments on dynamo action and magnetically triggered flow instabilities, with special focus on the precession driven liquid sodium experiment and the large-scale MRI experiment that are under construction in the framework of the DRESDYN project at HZDR.
Particular emphasis is placed on generic questions such as the reversal mechanism of the geodynamo and the possibility of a planetary synchronization of the solar dynamo, on which those experiments might shed some fresh light. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Thomas Thiemann, Erlangen Nürnberg | |
The Hamiltonian approach to quantum gravity initiated by Bergman, Dirac, DeWitt, Komar, Wheeler et al has a long tradition and many quantum gravity programmes rest on it. While there has been progress in the past, the current theory is still not predictive because the Einstein-Hilbert Lagrangian is not even polynomial in the metric field which triggers many quantisation ambiguities. To eliminate those, renormalisation methods suggest themselves, preferrably directly in the Hamiltonian rather than the path integral language. After an introduction to those concepts, in this talk we present such a Hamiltonian renormalisation scheme which is derived from Wilson's notion of non-perturbative renormalisation of path integrals together with methods from constructive QFT. As a test we study Hamiltonian renomalisation of parametrised field theory in 2D which is a toy model for 4D quantum gravity in the sense that both theories are subject to the hypersurface deformation algebroid shared by all generally covariant field theories. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Giovanni Masciocchi, Institute of Physics | |
Strain control of magnetization: an opportunity for innovative magnetic sensors | |
|
14 Jun 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Seyda Ipek, Carleton University, USA | |
Everything around us, cookies, rocks, stars, galaxies... is made up of “matter” and not “antimatter”. We know that if antimatter comes close to matter, they annihilate each other leaving only energy behind. That we are here means there is no antimatter to annihilate with us! But what happened to the antimatter in the Universe? Where did it go? How did it disappear? Why/how did matter stay behind? The referent will talk about this mystery and possible ways around it, which requires new physics beyond the Standard Model of particle physics. Slides here... | |
|
15 Jun 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 15:00 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Atieh Razavi, TU Darmstadt, Physics | |
TBA | |
| at Zoom | |
|
20 Jun 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Dr. Simone Pirrotta, Italian Space Agency (ASI) Rome, Italy | |
Small satellites are nowadays extremely powerful, flexible and sustainable platforms that can be used to complement the missions usually assigned to larger spacecrafts. Modularity, standardization, intensive use of state-of-the art COTS technologies consent to prepare cheaper missions in shorter timeframes, thus allowing a more frequent access to space environment, including Cislunar and Interplanetary. The Italian Space Agency – ASI promotes, funds and coordinates the national initiatives also in this promising sector, both for national missions and within international cooperation. The first products of this effort are ArgoMoon and LICIACube, both 6U cubesats which operated during 2022 as first Italian spacecrafts beyond the Low Earth Orbit. The Light Italian Cubesat for Imaging of Asteroids - LICIACube participated in the NASA Double Asteroid Redirection Test - DART mission, the first active Planetary Defense mission; on September 26th 2022, few minutes after DART’s impact on asteroid Dimorphos, LICIACube captured unique images of the impact effects, primarily the plume of ejecta, and the not visible side of the secondary asteroid. The operations have been conducted by a national team coordinated by ASI. The design, manufacturing, testing and operations of the space and ground segment elements have been performed by the Italian firm Argotec under ASI management, while a wide scientific team supported the investigation preparation with impact modelling simulation and data analysis and interpretation, under the coordination of the National Institute of Astrophysics INAF. The engineering teams of Polytechnic of Milan and University of Bologna were in charge of trajectory design and optimization and the orbit determination and navigation, respectively.
Captured images during the challenging fly-by confirmed the DART success as Planetary Defense initiative and provided scientists with highly valuable data, that allowed a first set of results to be confirmed and are currently under further analysis for scientific investigations. In fact, on October 11th 2022, NASA announced the complete success of the DART mission, confirming that the spacecraft’s impact altered Dimorphos’ orbit around Didymos by 32 minutes. Moreover, The LICIACube images show that the DART impact on Dimorphos generated a cone of ejected surface material with a large aperture angle. This plume has a complex and inhomogeneous structure, characterized by non-radial filaments, dust grains, and single and clustered boulders that allows us to deeply investigate the nature of the ejecta and the structure of Dimorphos. | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Thomas Becher, Bern | |
In cross sections involving angular cuts, intricate patterns of enhanced higher-order corrections known as non-global logarithms arise. These corrections do not exponentiate and to resum them to all orders one has to resort to numerical techniques. The resummation of the leading non-global logarithms was achieved twenty years ago, but higher-logarithmic resummations remained elusive. In my talk, I will show how such resummation can be performed using renormalization group methods in effective field theory. I will demonstrate how the associated evolution equations can be implemented into a Monte-Carlo framework and will present first numerical results for higher-logarithmic resummations at both lepton and hadron colliders. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Kilian Leutner, Institute of Physics | |
Simulation and detection of topological spin structures | |
|
21 Jun 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Marcos Marino, Geneva University, Switzerland | |
Perturbation theory remains one of the main tools in physics, in particular in quantum theories. However, most perturbative series diverge factorially, and it is not obvious how to extract information from them. Their divergence also suggests that, in order to obtain accurate results, one might need additional non-perturbative information. The theory of resurgence has been proposed as a general framework to address these issues. In this talk the referent will give an introduction to this theory and will illustrate it with applications -old and new - in quantum mechanics and in quantum field theory. Slides here... | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Abhishek Singharoy, Arizona State University | |
Molecular modeling of biomolecular assemblies exemplifies a disruptive area holding both promises and contentions. We will start with a brief story of simulating the first ever cell organelle in molecular details to find how nature has chosen survival fitness over efficiency of energy transfer as an evolutionary design (Cell, 2020). Despite such advances in exascale computing, biophysical simulation continues to grapple with handling molecular diversity. So, we will employ deep learning approaches often used in Google searches, called the inception network, to marry interaction signatures from Alphafold models and proteomics analysis with predictable patient outcomes (Cell Sys, 2022). An application will highlight how molecular modeling is used at an industrial scale to de-risk vector-based vaccines for distribution across 194 countries (Sci Adv 2021). We will conclude by seeing how transient interactions are difficult to predict, and path integrals with reinforcement learning offer a possible way to track diversity of dynamics (NeurIPS, 2022). | |
|
22 Jun 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Sven Höfling, Technische Physik, Universität Würzburg | |
We will summarize recent progress made within our group on self-assembled quantum dot device development for quantum repeater and quantum computer applications. A particular emphasis will be on semiconductor quantum dots embedded in circular Bragg grating cavities. For scalability, spatially deterministic placement of quantum dots in bullseye cavities is pursued and tuning by electric and strain fields are implemented. To apply electric fields, a new device design for electrically contactable circular Bragg grating cavities in labyrinth geometry is employed.
In(Ga)As/GaAs quantum dots (QDs) are very attractive candidates to confine single excitons and single spins serving as solid state qubits in a mature semiconductor platform. While these qubits can be directly manipulated by optical means, both optical and electrical excitation of the QDs can be implemented to efficiently generate single photons or entangled photon pairs on demand. Light-matter interaction in coupled quantum dot-cavity systems can be widely controlled by embedding the QDs into microcavities.
In this presentation, we will summarize recent progress made within our group and plans on device development with self-assembled quantum dots intended for quantum repeater and quantum computer applications [1]. A particular emphasis will be on semiconductor quantum dots embedded in circular Bragg grating cavities [2,3]. For scalability, spatially deterministic placement of quantum dots in bullseye cavities is pursued and techniques for tuning by electric and strain fields are implemented. To apply electric fields, a new device design for electrically contactable circular Bragg grating cavities in labyrinth geometry is employed [4]. We report on the challenges experienced in obtaining high performance devices based on circular Bragg grating cavities and figures of merits achieved, outlining the prospects for these devices in quantum technology applications.
We are grateful for financial support of this work by the German Federal Ministry of Education and Research (BMBF) within the projects Q.Link.X, QR.X, MHLASQU, PhotonQ and QD-E-QKD. Expert technical assistance by Silke Kuhn, Adriana Wolf and Margit Wagenbrenner is gratefully acknowledged.
1. C.-Y. Lu and J.-W. Pan, Nature Nanotechnology 16, 1294-1296 (2021)
2. J. Scheuer and A. Yariv, IEEE J. Quantum Electron. 39, 1555-1562 (2003)
3. M. Davanco, M. T. Rakher, D. Schuh, A. Badolato, and K. Srinivasan, Appl. Phys. Lett. 99, 041102 (2011)
4. Q. Buchinger, S. Betzold, S. Höfling and T. Huber-Loyola, Appl. Phys. Lett. 122, 111110 (2023) | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7, |
| Bettina Keller, Freie Universität Berlin | |
Rare-event simulations with Girsanov reweighting | |
|
26 Jun 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Jack MacDonald, Institut für Physik | |
First physics results from the FASER experiment | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Kai Cieliebak, Augsburg | |
Algebraic structures arising in string topology and Rabinowitz Floer homology | |
| at Zoom | |
|
27 Jun 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Kate Scholberg, Duke University USA | |
Coherent elastic neutrino-nucleus scattering (CEvNS) is a process in
which a neutrino scatters off an entire nucleus. It is tremendously
challenging to detect, due to the tiny nuclear recoil. CEvNS was
measured for the first time by the COHERENT collaboration using the
unique source of neutrinos at the Oak Ridge National Laboratory
Spallation Neutron Source. This talk will describe the physics reach
of CEvNS, as well as COHERENT's measurements, status and future plans. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Hendrik Meer, Institute of Physics | |
Control and manipulation of antiferromagnetic domains in insulating transition metal oxides | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Maria Anayeli Ramirez Ortiz, Milano Bicocca | |
The AdS3/CFT2 correspondence provides the best arena to test the holographic duality. This is because there is a better understanding of how to quantise strings on AdS3, compared with the higher dimensional cases, and the relative tractability of two-dimensional CFTs. In spite of this, little effort has been made to construct and classify supersymmetric AdS3 solutions. With a focus in their CFT interpretation, in this talk I will show you new AdS3 solutions in massive type IIA supergravity preserving small N=(4,0) supersymmetry. From the geometry, we engineer the dual CFT with well-known tools and propose a duality with a precise family of quivers. Additionally, we compute field theory and holographic central charges showing a clean matching in both descriptions. | |
|
28 Jun 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Daniel Wenz, JGU Mainz | |
A rich number of astrophysical and cosmological observations indicate the existence of a massive, non-luminous and non-baryonic matter component which is commonly referred to as dark matter (DM). One well motivated class of DM are weakly interacting massive particles (WIMPs) which arise naturally from several beyond-Standard-model theories.
The XENON dark matter project aims for the direct detection of WIMPs utilizing the concept of a dual-phase time projection chamber (TPC), currently operating the 4th generation of XENON experiment, XENONnT, at the INFN Laboratori Nazionali del Gran Sasso underground laboratory. XENONnT was designed as a fast upgrade of its predecessor XENON1T, augmented by many new subsystems -- among them the world's first water Cherenkov neutron veto. The XENONnT TPC features a sensitive liquid xenon mass of 5.9 t and an unprecedented low background of intrinsic 85Kr and 222Rn, leading to an electronic recoil background rate of (15.8 +/- 1.3) events / t year keV in the region of interest.
In this seminar we will report on the first WIMP search results with the XENONnT experiment, conducted in a blind analysis in an energy range between 3.1 keV and 60.0 keV, and an exposure of approximately 1.1 tonne-year. Slides here... | |
|
29 Jun 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Benno Liebchen, TU Darmstadt, Physics | |
TBA | |
| at Zoom | |
|
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Dr. Leif Schröder, Helmholtz Imaging + DKFZ Heidelberg | |
Chemical exchange processes play an important role for various soluble molecular systems with cavities. Hyperpolarized 129Xe gives insights into the underlying kinetics and structure parameters by providing a spin system that comes with several NMR spectroscopic advantages. It contributes to the understanding of synthetic molecules for binding greenhouse gases or characterizes hydrophobic pockets in naturally occurring proteins. This talk gives an overview how 129Xe is a powerful probe to explore such cavities. The nuclear spin of an inert gas is a useful “spy” that reveals, e.g., hidden states of different molecular symmetry. It also enables “spin counting” to quantify the attoliter volume in hollow protein structures. Such structures, normally used by bacteria to adjust their buoyancy in water, may one day also improve medical magnetic resonance imaging. Bacterial gas vesicles fill up with the harmless noble gas xenon according to the ideal gas law and have the potential to serve as powerful MRI contrast agents. | |
|
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 14:00 Uhr s.t., 01-122 Newton Raum |
| Oleksandr V. Pylypovskyi, Helmholtz-Zentrum Dresden-Rossendorf e.V. | |
The geometry of magnetic objects at the nanoscale plays a crucial role in their properties. Conventionally, the respective phenomena were considered for a long time as a result of sample boundaries leading, e.g., to the formation of closed-flux magnetization distributions and the interaction of magnetic solitons with notches in racetracks. However, such a simplified picture omits the topological properties and symmetries of the sample. A quantitative approach to predict magnetic responses based on the geometry of magnetic nanoarchitectures is provided by the theory of curvilinear magnetism.
In this talk, we will discuss analytical approaches and some experimental validations of theoretical predictions for curvilinear nanomagnets. The local bends and twists of low-dimensional ferromagnets enable chiral and anisotropic responses stemming from the exchange interaction. For the particular sample scale, these responses are complemented by the magnetostatics-induced symmetry breaks and the respective formation of multiple magnetochiral characteristics of the magnetic textures. Antiferromagnetic nanoobjects inherit particular properties of curvilinear ferromagnets and complement them with more complex properties of the Neel order parameter and field-induced spin-reorientation transitions. | |
|
03 Jul 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Emanuel Meuser, Institut für Physik | |
Phase-2 Upgrades for the ATLAS hardware trigger system and MZ firmware development for L0Global | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Tony Pantev, U. Penn | |
Wild character varieties parametrize monodromy representations of flat meromorphic connections on compact Riemann surfaces. They are classical objects with remarkable geometric and topological properties. In the past twenty years new insights from algebraic geometry lead to precise conjectures on the topological structure and complexity of character varieties. I will recall some of these conjectures and will sketch a strategy for approaching them. In particular I will describe recent joint works with Chuang, Diaconescu, Donagi, and Nawata in which we use dualities in geometry and physics to extract cohomological invariants of wild character varieties from enumerative Calabi-Yau geometry and refined Chern-Simons invariants of torus knots. | |
| at Zoom | |
|
04 Jul 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Paul Indelicato, University of Sarbonne - France | |
Quantum electrodynamics (QED) is part of the standard model and the best understood quantum field theory. Many tests exist, from free particles (electron and muon anomalous magnetic moment) to bound states. From the historical measurement of the Lamb-shift which lead to the advent of QED and field theories, many systems have been studied and compared to the most advanced calculations. One can cite hydrogen, positronium, muonium, highly charged, few electron ions[1] and exotic atoms (atoms in which the electron is replaced by a heavier particle like a muon, a pion or an antiproton).
In this talk I will present a few cases of highly charged ions high-precision results (few ppm accuracy) obtained with our Double Crystal Spectrometer in Paris[2-4] for medium-Z elements, and preliminary results obtained at GSI on few-electron uranium. I will then present new ideas [5] and first demonstration results on QED tests using muonic atoms and transition-edge sensor micro-calorimeter at JPARC [6, 7], and their extension to antiprotonic atoms at ELENA in the future. Detailed comparison with QED and relativistic many-body calculations when relevant will be made.
[1]Topical Review: QED tests with highly-charged ions, P. Indelicato. J. Phys. B 52, 232001 (2019).
[2]High-precision measurements of n=2->n=1 transition energies and level widths in He- and Be-like Argon Ions, J. Machado, C.I. Szabo, J.P. Santos et al. Phys. Rev. A 97, 032517 (2018).
[3]Reference-free measurements of the 1s 2s 2p 2P1/2,3/2 → 1s2 2s 2S1/2 and 1s 2s 2p 4P5/2 → 1s2 2s 2S1/2 transition energies and widths in lithiumlike sulfur and argon ions, J. Machado, G. Bian, N. Paul et al. Phys. Rev. A 101, 062505 (2020).
[4]Absolute measurement of the relativistic magnetic dipole transition in He-like sulfur, J. Machado, N. Paul, G. Soum-Sidikov et al. Phys. Rev. A in press, (2023).
[5]Testing Quantum Electrodynamics with Exotic Atoms, N. Paul, G. Bian, T. Azuma et al. Phys. Rev. Lett. 126, 173001 (2021).
[6]Deexcitation Dynamics of Muonic Atoms Revealed by High-Precision Spectroscopy of Electronic K X Rays, T. Okumura, T. Azuma, D.A. Bennett et al. Phys. Rev. Lett. 127, 053001 (2021).
[7]Proof-of-Principle Experiment for Testing Strong-Field Quantum Electrodynamics with Exotic Atoms: High Precision X-ray Spectroscopy of Muonic Neon, T. Okumura, T. Azuma, D.A. Bennett et al. Phys. Rev. Lett. in press, (2023). | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Pouria Mazloumi, MPP Munich | |
In this talk, I will discuss different types of integrals over moduli space of punctured Riemann surfaces. First, I start with string scattering amplitudes and progress to the intersection number of twisted forms over the Riemann surface. I will discuss the equivalency between the two integrals and how this relation can be used to produce QFT (tree-level) amplitudes. In particular, I explore the double copy construction in amplitudes, which states that gravitational amplitudes can be expressed in terms of two sets of Yang-Mills amplitudes i.e.gravity=(gauge X gauge). I will motivate a formal construction of double copy in terms of the twisted cohomology and explain its relation to other forms of the double copy such as BCJ double copy and color kinematic duality. I will finish by discussing the possibility of extending this formalism into the loop level in both string and QFT amplitudes. | |
|
06 Jul 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Daniel Rodriguez, Universidad de Granada | |
Penning traps are used to perform motional-frequency measurements to deliver the most precise and accurate cyclotron-frequency values of many atomic/molecular ions and charged (anti)particles. By applying laser cooling, it is possible to better control those effects arising from deviations of the Penning trap from the ideal configuration. Since laser cooling can be only performed on a few ion species, a single laser-cooled (auxiliary) ion can be used to cool the target ion, forming an ordered structure along the magnetic-field axis of the Penning trap.
At the University of Granada, we have built a 7-T Penning-trap platform and generated the (unbalanced) Coulomb crystals 42Ca+-40Ca+, 232Th+ -40Ca+ and 232ThO+-40Ca+, establishing the basis to perform quantum Penning-trap mass spectrometry and with prospects to explore laser-spectroscopy. In this talk, I will present the first Penning-trap eigenfrequency measurements using two-ion Coulomb crystals, from the detection of fluorescence photons, and will show the work carried out towards the final goal in our lab, including the recent upgrade of the laboratory after the installation of a new cryogen-free magnet. | |
|
07 Jul 2023
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 9 |
| Erik Kalz and Abhinav Sharma, Leibniz-Institut für Polymerforschung Dresden & TU Dresden | |
The Physics of Odd Systems | |
|
10 Jul 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Florian Thomas, Institut für Physik | |
Neutrino Mass Sensitivity of Project 8 | |
| at Zoom | |
|
11 Jul 2023
Physikalisches Kolloquium
Institut für Kernphysik 16:15 Uhr s.t., HS KPH |
| Prof. Susana Cardoso de Freitas, INESC MN University of Lisboa - Portugal | |
Magnetic field sensors have a mature and transversal level of implementation in the market, from automotive to biomedical domains. The impressive technological progress in thin film preparation and characterization, combined with nano-microfabrication tools offer presently large spectra for device design. The materials discussed include several varieties of thin film materials combined onto multilayer stacks. In addition, the noise mechanisms (the “killing factor” that limits the MR sensor performance) will be discussed, and I will show successful strategies for improving the signal-to-noise ratio, improving the ultimate field detectable by an MR sensor.
Examples where spintronic sensors are useful tools for precision sensing will be provided, including integration with microfluidics, optical and MEMS micromachined actuators. During my talk, I will show how challenging applications have identified creative solutions, requiring joint skills in transversal areas as physics, materials, electronics and mechanical engineering. | |
|
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Olga Lozhkina, Institute of Physics | |
Domain wall propagation in soft magnetic wires with periodical width modulation | |
|
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Cristina Benso, MPIK Heidelberg | |
In our current understanding of the universe, the fundamental nature of one of its most abundant constituents, the dark matter (DM), is still a mystery. Among the many theorized candidates to play the role of DM, in this talk I will focus on sterile neutrinos with mass of O(keV) and in particular on their production in the early universe and phenomenology in terrestrial experiments today. The simplest mechanism able to produce sterile neutrino DM in the early universe is named Dodelson-Widrow mechanism after its inventors. Although very fascinating due to its extreme simplicity, if we assume that sterile neutrinos constitute the entire abundance of DM today this vanilla solution is, on the one hand, far from the region of the parameter space in which near future experiments will be sensitive to such particles and, on the other hand, mostly excluded by X-ray observations. After introducing the standard/vanilla scenario, I will discuss three minimal modifications to the standard scenario that change drastically the perspectives of detection of this DM candidate in the near future. They have to do with the following questions. What if before Big Bang Nucleosynthesis the universe evolved differently with respect to what is usually assumed? Should we consider the X-ray bound to be absolute or model dependent? What if active neutrinos interact among each other also with non-standard interactions? | |
|
12 Jul 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Thomas Schwetz, KIT Karlsruhe | |
In this talk the referent reviews the recent status of the hypothesis of sterile neutrinos with masses in the eV range, motivated by oscillation searches at short baselines. Indications for muon to electron neutrino transitions from the LSND and MiniBooNE experiments are in severe tension with constraints from disappearance experiments. Previous hints for electron neutrino disappearance at short-baseline reactor experiments are neither confirmed by recent data (among others from the STEREO experiment) nor supported by updated reactor flux determinations. However, previous indications from radio-active source experiments in gallium detectors have been recently confirmed by the BEST collaboration, which observes a neutrino-induced count rate about 20% lower than expected at about 5 sigma significance. However, an explanation in terms of sterile neutrinos is in strong tension with other constraints. If any of these anomalies is due to new physics, most likely more ingredients than sterile neutrino oscillations are required. The referent will comment on possible explanations of the gallium anomaly in terms of quantum decoherence. | |
|
13 Jul 2023
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 18:00 Uhr s.t., hybrid meeting, Minkowski Room, 05-119, Staudingerweg 7 |
| Martin Vögele, Schrödinger | |
Hybrid meeting; ID: 814 7712 9515, Passcode: 008795 | |
Time to be determined. |
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Asst. Prof. Tracy Northup, Universität Innsbruck | |
Entanglement-based quantum networks hold out the promise of new capabilities for secure communication, distributed quantum computing, and interconnected quantum sensors. However, only a handful of elementary quantum networks have been realized to date.
I will present results from our prototype network, in which two calcium ions are entangled with one another over a distance of 230 m, via a 520 m optical fiber channel linking two buildings. The ion-ion entanglement is based on ion-photon entanglement mediated by coherent Raman processes in optical cavities. I will discuss the advantages of trapped ions for quantum networks and the role that cavities can play as quantum interfaces between light and matter at network nodes. After examining the key metrics for remote entanglement, we will consider the necessary steps to extend this work to long-distance networks of entangled quantum processors. | |
|
17 Jul 2023
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Moritz Hesping, Institut für Physik | |
Differential Measurement of Higgs Boson Associated Production with H-to-WW Decay at ATLAS | |
| at Zoom | |
|
RIND seminar on Mathematical Physics and String Theory
U. Mainz, LMU Munich, U. Heidelberg, U. Vienna 16 Uhr c.t., None |
| Lorenz Schlechter, Utrecht U. | |
TBA | |
| at Zoom | |
|
18 Jul 2023
Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:15 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| Olena Tkach, Institute of Physics | |
Recent developments in ToF momentum microscopy | |
|
Physikalisches Kolloquium
Institut für Kernphysik 16 Uhr c.t., HS KPH |
| Prof. Dr. Winfried Barth, GSI Helmholtzzentrum für Schwerionenforschung GmbH | |
Research on and with ions has been the subject of current scientific activities for some time. In particular, heavy ions with very different particle energies are of increasing interest. The provision of electrically charged "heavy" particle fluxes of high density and the acceleration of these particle beams is therefore of particular importance and has grown into an almost independent focus of research and development. In the talk, a brief outline of the past development of key technologies for accelerating heavy ions, especially in linear accelerators, will be given. The heavy ion linear accelerator at GSI in Darmstadt has to be upgraded for the future as a synchrotron-injector for highest intensities. In addition, the HElmholtz LInear ACcelerator HELIAC, a superconducting accelerator with the highest continuous wave intensities for heavy ion beams in the medium energy segment, is currently being designed and construction has already begun. These brand-new developments will also be presented.
Die Forschung an und mit Ionen ist seit längere Zeit Gegenstand aktueller wissenschaftlicher Aktivitäten. Insbesondere schwere Ionen mit sehr unterschiedlicher Teilchenenergie sind dabei von zunehmendem Interesse. Die Bereitstellung elektrisch geladener "schwerer" Teilchenflüsse hoher Dichte und der Beschleunigung dieser Teilchenstrahlen kommt daher besondere Bedeutung zu und ist zu einem fast eigenständigen Schwerpunkt der Forschung und Entwicklung gewachsen. Im Vortrag soll ein kurzer Abriss der vergangenen Entwicklung der Schlüsseltechnologien zur Beschleunigung schwere Ionen insbesondere in Linear-beschleunigern gegeben werden. Der Schwerionenlinearbeschleuniger der GSI in Darmstadt muss für die Zukunft als Synchrotron-Injektor für höchste Intensitäten aufgerüstet werden. Darüber hinaus wird zurzeit mit dem HElmholtz LInear ACcelerator HELIAC ein supraleitender Beschleuniger mit höchstem Dauerstrichintensitäten für Schwerionenstrahlen im mittleren Energiesegment konzipiert und auch bereits begonnen zu bauen. Diese brandaktuellen Neuentwicklungen sollen ebenfalls dargestellt werden. | |
|
19 Jul 2023
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Rodolfo Ferro-Hernandez, JGU Mainz | |
The fine structure constant is a fundamental parameter in the Standard Model, playing a crucial role in computing a wide range of observables and consistency relations. While the current error on $\Delta\alpha(M_Z)$ is at the level of $\sim10^{-4}$, future requirements, such as those of the FCC-ee/ILC, demand a reduction. In this talk, the referent presents an updated calculation of the hadronic contribution to $\Delta\alpha(M_Z)$. He will review different computational methods, such as the explicit integration in the timelike , renormalization group equations (RGE), and the euclidean split technique. The results emphasize the importance of accurately accounting for the charm quark contributions. | |
|
20 Jul 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Asst. Prof. Dylan Yost, Colorado State University | |
Because of atomic hydrogen’s simplicity, its energy levels can be precisely described by theory. This has made hydrogen an important atom in the development of quantum mechanics and quantum electrodynamics (QED). While one can use hydrogen spectroscopy to determine the Rydberg constant and the proton charge radius, a discrepancy of these constants determined through different transitions, or in different species, can indicate new physics. Such discrepancies currently persist between different measurements in hydrogen and muonic hydrogen.
With this motivation in mind, I will discuss several precision spectroscopy measurements of hydrogen as Colorado State University including a relatively recent measurement of the hydrogen 2S-8D two-photon transition, a measurement of the hydrogen 2S hyperfine splitting, and our future plans to measure several relatively narrow 2S-nS transitions in hydrogen. If these latter measurements are successful, they could provide some of the most precise measurements of the Rydberg constant along with insight into the experimental discrepancies. | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Online |
| Jerelle Joseph, Princeton University | |
Accurate models for interrogating and engineering biomolecular condensates | |
|
21 Jul 2023
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Elias Bernreuther, Fermilab | |
Searches for long-lived particles (LLPs) are a rapidly expanding
frontier at the LHC and other collider experiments. Still, many gaps
remain in the current search program, in particular for LLPs with masses
at the GeV or sub-GeV scale and with very large decay lengths. In this
talk, I will illustrate two different approaches to filling this gap by
discussing two models of light LLPs and their associated collider
signals. First, I will show that the dominant decay mode of vectorlike
leptons can be a very long-lived pseudoscalar and a tau lepton and argue
that the muon chambers of CMS or ATLAS are ideal places to search for
this final state. Second, I will illustrate the excellent sensitivity of
Belle II to light LLPs with meter-scale decay lengths using the example
of displaced vertex signals from strongly interacting dark sectors. | |
|
25 Jul 2023
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Tin Sulejmanpasic, Durham U. | |
I will introduce a formalism for abelian lattice gauge theories called the Modified Villain Action formalism, which has been popular in recent years for constructing abelian gauge theories with correct symmetries and anomalies of their continuum counterparts. I will then show that this formalism can be used to write down a \(U(1)\) Chern-Simons theory on the lattice for even levels. The theory we construct suffers from the peculiar zero modes of the Gaussian differential operator which are infamous in the literature for plaguing the Chern-Simons theory with unphysical modes. I will show that such modes are related to a peculiar subsystem symmetry of a space-time lattice. This symmetry causes almost all Wilson loops to vanish. However Wilson loop-like operators with strip-like topology survive the pernicious symmetry and are topological, exactly like one expects in the continuum. Further the strip-like topology of the loops is a lattice realization of a well known phenomenon in continuum called the framing anomaly. I will further argue, time permitting, that the pernicious symmetry is really a form of gauge symmetry, projecting out certain states from the Hilbert space, and that it is not associated with any physical significance. | |
|
10 Aug 2023
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 14:00 Uhr s.t., 01-122 Newton Raum |
| Dr. Naoto Yamashita, Department of I&E Visionaries Faculty of Information Science and Electrical Engineering Kyushu University | |
Spin Metal-Oxide-Semiconductor Field-Effect transistor (MOSFET) is a promising device [1] that utilizes the fundamental material in electronics: silicon (Si). In 2007, the electrical injection of spin current into Si was achieved, overcoming the challenge of "conductance mismatch" [2]. Over the past decade, extensive research has been devoted to studying the transport of spin current in Si, resulting in the realization of room temperature operation [3].
In our investigations to enhance the magnetoresistance ratio, we have focused on understanding the physics of the metal/Si interface and proposed three different approaches [4-6]. Firstly, we have made progress by improving the crystal alignment between the spin source material and the tunneling barrier through moderate-temperature thermal annealing [4]. Secondly, we have demonstrated the spin-dependent Seebeck effect, a novel spin caloritronic effect, for the first time using semiconducting materials [5]. Lastly, we have achieved a significant reduction in electrical resistance at the interface by implementing ohmic contact on non-degenerate n-type Si with ferrimagnetic material, resulting in a 100-fold improvement [6].
By leveraging these technologies, we anticipate a notable improvement in the magnetoresistance ratio, bringing us closer to practical device applications.
Reference
[1] S. Sugahara and M. Tanaka, Appl. Phys. Lett. 84, 2307 (2004).
[2] I. Appelbaum, B. Huang, and D. J. Monsma, Nature 447, 295-298 (2007).
[3] T. Tahara, Y. Ando, M. Shiraishi, et al., Appl. Phys. Express 8, 113004 (2015).
[4] N. Yamashita, Y. Ando, M. Shiraishi, et al., AIP Advances 10, 095021 (2020).
[5] N. Yamashita, Y. Ando, M. Shiraishi, et al., Phys. Rev. Applied 9, 054002 (2018).
[6] N. Yamashita, M. Shiraishi, Y. Ando, et al., Phys. Rev. Materials 6, 104405 (2022). | |
|
07 Sep 2023
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 13:30 Uhr s.t., Online |
| Yuichi Masubuchi, Department of Materials Physics, Nagoya University, Japan | |
Effect of node functionality on the fracture of polymer networks | |
|
14 Sep 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Mike Howard, Chemical Engineering, Auburn University, USA | |
Materials made from nanoparticles (NPs) have highly versatile applications, ranging from household products such as paint to functional materials used for catalysis and optoelectronics. The properties of such materials can be tailored through the chemistry of their NPs as well as the NP composition within the material. A common method to prepare such materials is to disperse the NPs in a solvent at a low volume fraction, then remove the solvent to assemble the NPs into a solid. For example, solvent drying from planar surfaces has been used to make abrasion- and bacteria-resistant NP coatings, while solvent drying from spherical droplets has been used to make porous supraparticles with significant internal void space that is promising for catalysis, photonics, and sorption. The mesoscopic structure of the NPs within these materials is known to depend on both properties of the NPs and the drying conditions; however, predicting it is challenging because the NP self-assembly involves confined molecular thermodynamics and nonequilibrium transport. In this seminar, I will discuss our efforts to use both particle-based simulations and continuum modeling (dynamic density functional theory) to model drying-induced assembly in colloidal suspensions. The two types of models shed different insights into the self-assembly process at different scales. Our principal finding is that solvent-mediated hydrodynamic interactions between NPs play a critical role in the drying process that must be captured to faithfully resolve the final structure in many cases. In future, we envision using these models to design NPs and drying processes to assemble them into materials with targeted compositions. | |
| at Zoom | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Mike Howard, Chemical Engineering, Auburn University, USA | |
GRK 2516 Soft Matter Seminar | |
|
22 Sep 2023
Theorie-Palaver
Institut für Physik Sonderseminar: 10 Uhr c.t., THEP seminar room (05-427) |
| Hidenori SONODA, Kobe University | |
I would like to explain how the construction of a Wilson action in the exact renormalization group (ERG) formalism is related to diffusion equations for the fields. By making the diffusion equations gauge covariant, we have managed to linearize the BRST invariance of U(1) gauge theories. But with YM theories, the BRST invariance remains non-linear, and we have not been able to solve the constraint. All this has been done in collaboration with Hiroshi Suzuki (Kyushu University). | |
Sonderseminar | |
|
zukünftige Termine
25 Sep 2023
MMA 23 Conference (Sept 25th-28th)
Johannes Gutenberg-Universität Mainz, Institut für Physik 8:00 Uhr s.t., Alte Mensa, Johann-Joachim-Becher-Weg 3, 55128 Mainz |
| Dr. Martin Letz, SCHOTT AG | |
12th International Conference on Microwave Materials and their Applications (MMA23 from 25th to 29th September 2023) | |
|
26 Oct 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Alexandre Obertelli, TU Darmstadt Institut für Kernphysik | |
TBA | |
|
02 Nov 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Jörn Müller-Quade, KIT Karlsruhe Kryptographie & Sicherheit | |
TBA | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Vishal Maingi, Bioengineering, Caltech | |
TBA | |
| at Zoom | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Online |
| Vishal Maingi, Bioengineering, Caltech | |
GRK 2516 Soft Matter Seminar | |
|
09 Nov 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Dr. Hendrik Poulsen Nautrup, Universität Innsbruck Institut für Theoretische Physik | |
TBA | |
|
16 Nov 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Marcus Müller, Institute for Theoretical Physics, Uni Göttingen | |
TBA | |
| at Zoom | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Marcus Müller, Institute for Theoretical Physics, Uni Göttingen | |
GRK 2516 Soft Matter Seminar | |
|
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Wilfried Nörtershäuser, TU Darmstadt Institut für Kernphysik | |
TBA | |
|
23 Nov 2023
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Dr. Nils Huntemann, PTB Nationales Metrologieinstitut | |
TBA | |
|
30 Nov 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Dijkstra, Marjolein, Computational Condensed Matter, Utrecht University | |
TBA | |
| at Zoom | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Marjolein Dijkstra, Computational Condensed Matter, Utrecht University | |
GRK 2516 Soft Matter Seminar | |
|
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Catalina Curceanu, INFN, Rom/Italy | |
TBA | |
|
14 Dec 2023
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Florian Mast, JGU, Chemistry | |
TBA | |
| at Zoom | |
|
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Florian Mast, JGU, Chemistry | |
GRK 2516 Soft Matter Seminar | |
|