Jahresübersicht für das Jahr 2021
07 Jan 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., None |
| Prof. Dr. Antoine Browaeys, Laboratoire Charles Fabry, Palaiseau, France | |
This talk will present our effort to control and use the dipole-dipole interactions between cold atoms in order to implement spin Hamiltonians useful for quantum simulation of condensed matter or quantum optics situations. We trap individual atoms in arrays of optical tweezers separated by a few micrometers. We create almost arbitrary geometries of the atomic arrays in two and three dimensions up to about 200 atoms. To make the atoms interact, we either excite them to Rydberg states or induce optical dipoles with a near-resonance laser. Using this platform, we have in particular explored quantum magnetism, topological synthetic quantum matter, and a new light-matter interface. | |
| at Zoom | |
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11 Jan 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Bastian Schlag, Institut für Physik | |
Vertexing in ATLAS | |
| at Zoom for now | |
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12 Jan 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Zheng-Tian Lu, University of Science and Technology of China | |
The long-lived noble-gas isotope 81Kr is the ideal tracer for water and ice with ages of 105 - 106 years, a range beyond the reach of 14C. 81Kr-dating, a concept pursued over the past five decades, is finally available to the earth science community at large. This is made possible by the development of the Atom Trap Trace Analysis (ATTA) method, in which individual atoms of the desired isotope are captured and detected. ATTA possesses superior selectivity, and is thus far used to analyze the environmental radioactive isotopes 81Kr, 85Kr, and 39Ar. These three isotopes have extremely low isotopic abundances in the range of 10-17 to 10-11, and cover a wide range of ages and applications. In collaboration with earth scientists, we are dating groundwater and mapping its flow in major aquifers around the world. We are also dating old ice from the deep ice cores of Antarctica, Greenland, and the Tibetan Plateau. For an update on this worldwide effort, please google “ATTA Primer”. | |
| at Recording of the presentation | |
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13 Jan 2021
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Daniele Guffanti, Institute of Physics, JGU Mainz | |
The Sun, as all the other stars, is fueled for most of its life by the fusion of hydrogen into helium taking place in its core. Neutrinos produced in such reactions are the only direct probe to the innermost part of our star and real time messengers of its engine. Decades of experimental and phenomenological efforts allowed us to study in detail the driving energy production mechanism in the Sun, the proton-proton chain, which is responsible for ~99% of the Sun luminosity. The fusion processes accounting for the remaining 1% are believed to be catalyzed by the presence of Carbon, Nitrogen and Oxygen (CNO-cycle) in the Sun interior, but a direct evidence of the occurrence of such mechanism was still missing.
After years-long efforts, the Borexino experiment at the Gran Sasso National Laboratories has recently reported the first direct observation of solar neutrinos produced in the CNO-cycle. In this talk I will present the Borexino findings and I will discuss the importance of CNO neutrinos for astrophysics and for our understanding of the Sun, particularly in connection to its chemical composition. | |
| at Zoom | |
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14 Jan 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., None |
| Tanya S. Roussy, M.A., JILA (University of Colorado Boulder & NIST) | |
Over the past few decades, accelerators have been the traditional venue for new particle discoveries – but the paradigm is shifting. Accelerator energies are likely to remain on a plateau for some time, while atomic physics & precision measurement are in a remarkable period of progress. Some limits have advanced by a factor of 100 in less than 10 years, and laser technologies are being refined to exquisite levels. New Physics searches are already an established avenue in the atomic physics field; from atomic parity violation, to EDM searches, to equivalence principle tests. Happily, many of these platforms are well-suited to do double-duty as broadband dark matter searches. In this talk, I will explain the basics of our unique trapped-ion electron EDM search, how we used our recent data to constrain the gluon to axion-like particle coupling over seven mass decades, and how we solved some important methodological issues along the way. | |
| at Zoom | |
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Theoriekolloquium
Die Dozierenden der Theoretischen Physik 16:00 Uhr s.t., usually Newton-Raum, Staudinger Weg 9, 01-122 |
| Dries Sels, New York University | |
Recent technological advances have put us at the brink of having access to small scale quantum computers capable of solving problems that cannot be tackled with classical computers. A limited number of algorithms have been proposed and their relevance to real world problems is a subject of active investigation. Solving problems relevant to chemistry are expected to be the first successful applications of quantum computers. In this talk, I will discuss a particular problem that can be solved efficiently on quantum computers: model inference for nuclear magnetic resonance (NMR) spectroscopy. I will give a broad introduction to quantum computing and NMR metabolomics assuming no prior knowledge of the subject. | |
| at Zoom | |
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15 Jan 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., via Zoom |
| Nathalie Katsonis, University of Groningen, The Netherlands | |
TBA | |
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18 Jan 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Eftychia Tzovara, Institut für Physik | |
ttH(bb) in ATLAS: inclusive and differential cross section | |
| at Zoom for now | |
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19 Jan 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Bernadett Weinzierl, University of Vienna, Austria | |
Aerosol particles are an important constituent of the global climate system. They not only affect the atmospheric radiation budget through scattering and absorption of solar radiation and through their role as cloud/ice nuclei but also impact air quality and human health. Both natural and human processes contribute to the global aerosol load. Whereas coarse‐mode aerosol (>1 μm diameter) mainly originates from natural aerosol sources, fine mode aerosol is frequently associated with human activities.
Although substantial effort has been undertaken in the last decades to improve our knowledge about aerosols and their role in the global climate system, aerosol‐cloud‐radiation interactions still pose the largest uncertainty to estimates and interpretations of the Earth’s changing energy budget (IPCC, 2013). In order to decrease these uncertainties, research is necessary. Thereby, research aircraft like the German Aerospace Center (DLR) Falcon and the NASA DC‐8 provide unique platforms to study the horizontal and vertical distribution of aerosols and their microphysical, chemical and optical
properties. In this talk, I will introduce aerosols in general, and discuss their effects on the atmosphere and climate. Furthermore, I will show selected results from airborne field experiments with the DLR research aircraft Falcon and the NASA research aircraft DC8 studying the long‐range transport of mineral dust (SALTRACE project), the global distribution of coarse mode aerosols (ATom project), and aerosol mixtures in the Eastern Mediterranean (A‐LIFE project). | |
| at Zoom | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Danny van Dyk, TUM, Munich | |
I will discuss theory predictions for exclusive b->s ll decays within the SM and beyond, with emphasis on the hadronic matrix elements. There are two categories of these matrix elements: local form factors, and nonlocal contributions arising from e.g. four-quark operators. I will report the status and report recent progress from QCD-based methods on the non-local hadronic matrix elements arising from intermediate charm states. A particular focus will be a recent derivation of a dispersive bound on the non-local matrix element as discussed in arXiv:2011.09813. | |
| at Zoom | |
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20 Jan 2021
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Jens Erler, JGU Mainz | |
The precise standard model | |
| at Zoom | |
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21 Jan 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., None |
| Prof. Dr. Hatice Altug, EPFL Lausanne, CH | |
New health initiatives with global healthcare, precision medicine and point-of-care diagnostics are demanding breakthrough developments in biosensing and bioanalytical tools. Current biosensors are lacking precision, bulky, and costly, as well as they require long detection times, sophisticated infrastructure and trained personnel, which limit their application areas. My laboratory is focused on to address these challenges by exploiting novel optical phenomena at nanoscale and engineering toolkits such as nanophotonics, nanofabrication, microfluidics and data science. In particular, we use photonic nanostructures based on plasmonics and dielectric metasurfaces that can confine light below the fundamental diffraction limit and generate strong electromagnetic fields in nanometric volumes. In this talk I will present how we exploit nanophotonics and combine it with imaging, biology, chemistry and data science techniques to achieve high performance biosensors. I will introduce ultra-sensitive Mid-IR biosensors based on surface enhanced infrared spectroscopy for chemical specific detection of molecules, large-area chemical imaging and real-time monitoring of protein conformations in aqueous environment. Next, I will describe our effort to develop ultra-compact, portable, rapid and low-cost microarrays and their use for early disease diagnostics in real-world settings. Finally, I will highlight label-free optofluidic biosensors that can perform one-of-a-kind measurements on live cells down to the single cell level, and provide their prospects in biomedical and clinical applications. | |
| at Zoom | |
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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., None |
| Scott Shell, UCSB, USA | |
tba | |
| at Zoom | |
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25 Jan 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Florian Thomas, Institut für Physik | |
Accelerating Physics computations with GPUs | |
| at Zoom for now | |
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26 Jan 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Viola Priseman, Max-Planck-Institution , Göttingen, Germany | |
How can we deal with a pandemic like COVID-19 so that neither health nor society and the economy suffer unnecessarily? We inferred the effectiveness of interventions, and developed effective containment strategies. Interestingly, we have identified a metastable state that not only stabilizes low case numbers, but also significantly reduces the necessary contact reductions and lockdowns. In this talk, we will introduce the underlying models, explore different containment strategies, and discuss recent developments. | |
| at Recording of the presentation | |
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Theorie-Palaver
Institut für Physik 17:30 Uhr s.t., MITP seminar room |
| Zhengkang (Kevin) Zhang, Caltech | |
Matching a UV theory onto a low-energy EFT can be efficiently accomplished with functional methods. The functional approach is conceptually appealing: all calculations are performed within the UV theory at the matching scale, and no prior determination of an EFT operator basis is required. In this talk, I will present a simple prescription for functional matching up to one loop order, which accommodates any relativistic UV theory that contains generic interactions among scalar, fermion and vector fields. I will also introduce STrEAM (SuperTrace Evaluation Automated for Matching), a Mathematica package that helps streamline the procedure. | |
| at Zoom | |
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28 Jan 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., None |
| Univ.-Prof. Dr. Tanja Mehlstäubler, Physikalisch-Technische Bundesanstalt, Braunschweig | |
Single trapped and laser-cooled ions in Paul traps allow for a high degree of control of atomic quantum systems. They are the basis for modern atomic clocks, quantum computers and quantum simulators. Our research aims to use ion Coulomb crystals, i.e. many-body systems with complex dynamics, for precision spectroscopy. This paves the way to novel quantum clocks for applications such as relativistic geodesy and improved navigation.
The high-level of control of self-organized Coulomb crystals also opens up a fascinating insight into the non-equilibrium dynamics of coupled many-body systems, displaying atomic friction and symmetry-breaking phase transitions. We discuss the creation of topological defects in 2D crystals and present recent results on the study of tribology and transport mediated by the topological defect. | |
| at Zoom | |
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29 Jan 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., via Zoom |
| Emanuela Zaccarelli, University of Rome | |
Microgels are soft particles individually made by cross-linked polymer networks which are nowadays widely used as a colloidal model system because of their swelling properties and their responsivity to external control parameters such temperature or pH. In this talk I will briefly illustrate the protocol that we recently developed to synthesize microgels in-silico, providing a realistic description of the particles. I will then focus on the calculation of their elastic properties and of the effective interactions in bulk and at liquid-liquid interfaces and compare the results with the famous Hertzian model. While we find that the validity of such model in bulk is fairly limited[1], when microgels are adsorbed at interfaces, they effectively behave as 2D elastic disks. Such soft interactions are predicted to show a reentrant liquid-glass-liquid behavior at high densities in a range of experimentally accessible conditions, namely for small and loosely cross-linked microgels[2].
[1] L. Rovigatti, N. Gnan, A. Ninarello and EZ, Macromolecules (2019).
[2] F. Camerin, N. Gnan, J. Ruiz-Franco, A. Ninarello, L. Rovigatti and EZ,
Phys. Rev. X (2020). | |
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01 Feb 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Asma Hadef, Institut für Physik | |
Scintillator Material Development for Neutron Reconstruction in DUNE Experiment | |
| at Zoom for now | |
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02 Feb 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Andy Brown, ECMWF, Reading, Great Britain | |
Accurate weather predictions are of huge value to society, being used to inform actions that save lives and money. They are also a scientific success story, with global 5 day forecasts today being as accurate as 2 days forecasts of 30 years go. This talk will summarize the approach used, recent progress and future research and development priorities. These include further advances in understanding and modelling of multiple components of the Earth system (eg atmopshere, land, ocean and sea-ice), developments in observations and data assimilation methods, and bringing together the physical and computational science communities to take full advantage of new supercomputer architectures and advances in data science. | |
| at Recording of the presentation | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Anders Eller Thomsen, University of Bern | |
RG functions are used in QFT to evolve theories between energy scales and are frequently used in both phenomenology and theory. Starting at the 3-loop order, certain RG functions start exhibiting poles in the dimensional expansion, contrasting with the expectation that they should be finite. In this talk, I will clarify how this issue can be understood and how it is linked with an ambiguity in choosing renormalization constants that goes beyond a simple choice of renormalization scheme. The discussion will lead to a preferred prescription for the RG functions, which guarantees finiteness. | |
| at Zoom | |
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03 Feb 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Oleg Tchernyshyov, Johns Hopkins University | |
https://www.spice.uni-mainz.de/2021/01/13/on-line-seminar-03-february-2021/ | |
| at Zoom and SPICE YouTube Channel | |
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04 Feb 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., None |
| Prof. David Cassidy, University College London, UK | |
Positronium (Ps) is a hydrogenic atom composed of an electron bound to a positron. Since it contains only leptons Ps is, for all practical purposes, a pure QED system, unaffected by nuclear structure effects. Also, being composed of a particle-antiparticle pair, Ps atoms are metastable, and may decay via self-annihilation, as well as through the usual radiative decay channels seen in regular atoms. The energy levels of Ps can be calculated to arbitrary precision (in principle), and precision spectroscopy of Ps can therefore be used to perform rigorous tests of bound-state QED theory. Moreover, since the theoretical description is limited only by the order of the calculations performed, rather than unknown physical constants or incalculable terms, any observed (and confirmed) disagreement with theory could indicate the existence of “new physics” such as particles or fields not currently included in the Standard Model.
In this talk I will describe some new measurements of the Ps n = 2 fine structure, specifically 2 ^3S_1--> 2 ^3P_J (J = 0,1,2) transitions. The experiments were performed using a radioactive isotope-based positron beam coupled to a buffer gas/Penning trap. This allows positron pulses to be generated, which are converted into a dilute Ps gas with in vacuum an initial number density on the order of 10^6 cm^-3. A pulsed dye laser was used to optically excite atoms to the 2 ^3S_1 level, and microwave radiation was used to drive transitions to the 2 ^3P_J levels, which decay radiatively to the ground state before annihilation. The different annihilation decay rates of the ground and excited (S) states allows the fine structure transitions to be monitored via the time spectrum of the Ps annihilation radiation.
We found that the measured J = 1 and J = 2 lineshapes exhibited significant asymmetries, whereas a symmetric lineshape was observed for the J = 0 transition. The observed asymmetries are not consistent with the most obvious quantum interference or line-pulling phenomena arising from nearby (off-resonant) transitions, and in the absence of a complete lineshape model we are therefore unable to determine the fine structure intervals for these transtions. Since the J = 0 lineshape did not exhibit any significant asymmetry it was possible to extract a value for the centre frequency: however, the obtained interval was found to disagree with theory by 2.77 MHz, which amounts to 4.5 standard deviations. No mechanism for a line shift of this magnitude has so far been identified. | |
| at Zoom | |
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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., None |
| Dr. Johannes Zierenberg, Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany | |
Despite decades of research on disease spreading and epidemic outbreaks, the worldwide outbreak of COVID-19 was accompanied by scientific uncertainty resulting in insecure political actions. While scientific knowledge about the disease is initially uncertain until studied in detail, the worldwide
available data on infected cases can be used to assess the current stage of the outbreak and allows for short term forecast of potential scenarios. Using a Bayesian framework even allows to incorporate and estimate parameter insecurity.
I will present such an approach to infer spreading parameters during the initial outbreak of COVID-19 in Germany, show how to use it for short-term
forecasts of potential scenarios, and argue that this approach adds a powerful tool to assist political decision making if the underlying assumptions and limitations are clearly communicated. I will further demonstrate how such models can be used to identify potential weak points in disease control, such as a limited tracing capacity. | |
| at Zoom | |
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05 Feb 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Lukas Stelzl, Institute of Physics, JGU Mainz | |
Multi-scale simulations of disordered proteins and their assemblies | |
| at Zoom | |
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08 Feb 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik Sonderseminar: 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Thomas Honig, Institut für Physik | |
Higgs Boson Cross Section Measurement in the W-Associated Production and Fully Leptonic Final State at 13 TeV with the ATLAS Experiment" | |
| at Zoom for now | |
Sonderseminar | |
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SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie
SFB/TR49 - Prof. Dr. Elmers 16:00 Uhr s.t., der Raum wird separat angekündigt |
| Ulrich Eckern, Augsburg University | |
Spin-charge conversion and spectral properties of heterostructures containing half-metals: The role of nonquasiparticle states | |
| at Zoom | |
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09 Feb 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Michael Feindt, University of Karlsruhe | |
This talk will review my personal history as elementary particle physics researcher (having started to work with neural networks at CERN in 1993), professor and entrepreneur (founder of Phi-T (2002) and Blue Yonder(2008)). It was always driven by what today is called Machine Learning and Artificial Intelligence, with emphasis on also predicting and taking advantage from knowledge about uncertainty.
Today Blue Yonder, specialized on AI/ML and decision automation in the supply chain from Manufacturing to Retail, has more than 3500 large companies worldwide as customers and has delivered more than 1 trillion predictions. Examples from many different areas (physics, insurance, retail, supply chain) and experience gained over many years will show the tremendous value, but also the difficulties in bringing these methods into real life production in large scale international collaborations and companies - often against resistance. | |
| at Recording of the presentation | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., MITP seminar room |
| Riccardo Barbieri, SNS Pisa | |
Motivated by the hierarchy problem and by the pattern of quark masses and mixings, I describe a picture of flavour physics that should give rise in a not too distant future to observable deviations from the SM in Higgs compositeness and/or in B-decays (if LFV confirmed) or perhaps even in supersymmetry, depending on the specific realization. | |
| at Zoom | |
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10 Feb 2021
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Nicola Neri, Università di Milano | |
Magnetic and electric dipole moments of fundamental particles provide powerful probes for physics within and beyond the Standard Model. For the case of short-lived particles these have not been experimentally accessible to date due to the difficulties imposed by their short lifetimes. A unique program of direct measurements of electromagnetic dipole moments of strange and charm baryons, and ultimately beauty baryons and the tau lepton, at the LHC is proposed. Novel experimental techniques have been developed, along with feasibility studies and projected sensitivities for different luminosity scenarios. | |
| at Zoom | |
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SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Claudia Felser, MPI Chemical Physics of Solids | |
Magnetic Materials and Topology | |
| at Zoom and SPICE YouTube Channel | |
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11 Feb 2021
Theoriekolloquium
Die Dozierenden der Theoretischen Physik 16:00 Uhr s.t., usually Newton-Raum, Staudinger Weg 9, 01-122 |
| Ehud Altman, UC Berkeley | |
From physics journals to campaign rallies, in this talk I'll try to explain what drives the remarkable popularity of the Sachdev-Ye-Kitaev model. In the first part I'll survey the evolution of this system from its origins as a solvable toy model of strongly interacting electrons to its current fame as a toy model of a quantum black hole. The latter came with Kitaev's discovery that, like a black hole, the low temperature dynamics of this model saturates the quantum bound on chaos. In the second part of the talk I will discuss how the model can be liberated from its status as a toy model by generalizing the physics from zero spatial dimensions to a genuine higher dimensional field theory. Time permitting I will discuss a specific application of such a field theory to describe unconventional quantum criticality in correlated electron systems. | |
| at Zoom | |
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Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., None |
| Dr. Stefan Ulmer, Ulmer Fundamental Symmetries Laboratory, RIKEN, Japan & CERN | |
The Standard Model of particle physics is both incredibly successful and glaringly incomplete. Among the questions left open is the striking imbalance of matter and antimatter in our universe, which inspires experiments to compare the fundamental properties of matter/antimatter conjugates with high precision. The BASE collaboration at the antiproton decelerator of CERN is performing such high-precision comparisons with protons and antiprotons. Using advanced, ultra-stable, cryogenic particle traps and superconducting detectors with single particle sensitivity, we have performed the most precise measurement of the proton-to-antiproton charge-to-mass ratio with a fractional uncertainty of 69 parts per trillion [1].
In another measurement, we have invented a novel spectroscopy method, which allowed for the first ultra-high precision measurement of the antiproton magnetic moment with a fractional precision of 1.5 parts in a billion [2]. Together with our recent measurement of the proton magnetic moment [3] this improves the precision of previous experiments [4] by more than a factor of 3000. A time series analysis of this recent magnetic moment measurement furthermore enabled us to set first direct constraints on the interaction of antiprotons with axion-like particles (ALPs) [5], and most recently, we have used our ultra-sensitive single particle detection systems to derive narrow-band constraints on the conversion of ALPs into photons [6].
In my talk I will review the recent achievements of BASE and will outline strategies to further improve our high-precision studies of matter-antimatter symmetry. This outlook will involve the implementation of sympathetic cooling of antiprotons using quantum logic methods, the development of the transportable antiproton trap BASE-STEP, and will also review recent experimental progress towards 10-fold improved measurements of the antiproton properties.
[1] S. Ulmer et al., Nature 524, 196 (2015).
[2] C. Smorra et al., Nature 550, 371 (2017).
[3] G. Schneider et al., Science 358, 1081 (2017).
[4] J. DiSciacca et al., Phys. Rev. Lett. 110, 130801 (2013).
[5] C. Smorra et al., Nature 575, 310 (2019).
[6] J. A. Devlin et al., Phys. Rev. Lett., accepted (2021).
S. Ulmer1, K. Blaum2, M. Bohman1,2, M. Borchert1,3, J. A. Devlin1,4, S. Erlewein1,2,4, M. Fleck1,5,
C. Smorra1, M. Wiesinger1,2, C. Will2, E. Wursten5, Y. Matsuda6, C. Ospelkaus3, W. Quint6, J. Walz7,8, Y. Yamazaki1
1RIKEN, Ulmer Fundamental Symmetries Laboratory, Saitama, Japan; 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany; 3Leibnitz University, Hannover, Germany; 4CERN, Geneva, Switzerland; 5The University of Tokyo, Tokyo, Japan; 6GSI - Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany; 7Johannes Gutenberg-Universität, Mainz, Germany; 8Helmholtz-Institut Mainz, Germany; | |
| at Zoom | |
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12 Feb 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., via Zoom |
| Jens-Uwe Sommer, Leibniz-Institute of Polymer Research Dresden and TU Dresden | |
The lower critical solution temperature (LCST) transition is introduced as type-II transition which results in many cases from competing effects of hydrogen bonding and hydrophobic behaviour of water-soluble polymers such as PEO and PNIPAm. As a consequence of the new type of phase separation a switch-like temperature response and phase coexistence is predicted for immobilized polymers such as polymer brushes or gels. I will give an introduction to simple theoretical concepts related with the type-II transition. Furthermore, I will demonstrate that mixed solvents can lead to type-II transitions with the prominent example of so-called co-nonsolvency [1]. Computer simulations and experiments confirm the basic conclusions from the theoretical model for polymer brushes [2,3]. Moreover, this phase transition is most likely driving the formation of protein-RNA-droplets in living cells. Using atomistic simulations it is shown for the example of PEO that stretching of the conformations can induce a phase transition far below the LCST which can be explained by the release of hydrogen bonds in the stretched state of PEO [4]. An aquamelt is introduced in general as a system where stretching/flow induces phase separation and subsquent crystallization, very similar to the process of spider-silk spinning in Nature. Aquamelts break the paradigm that solution properties of polymers are independent of conformation statistics.
[1]J.-U. Sommer, Gluonic and Regulatory Solvents: A Paradigm for Tunable Phase Segregation in Polymers, Macromolecules 51, 3066 (2018); Adsorption-Attraction Model for Co-Nonsolvency in Polymer Brushes, Macromolecules 50, 2219 (2017)
[2]A. Galuschko and J.-U. Sommer, Co-Nonsolvency Response of a Polymer Brush: A Molecular Dynamics Study, Macromolecules 52, 4120 (2019)
[3]H. Yong, E. Bittrich, P. Uhlmann, A. Fery and J.-U. Sommer, Co-nonsolvency transition of poly(N-isopropylacrylamide) brushes in a series of binary mixtures, Macromolecules 52, 6285 (2019)
[4]S. Donnets and J.-U. Sommer, J. Phys. Chem. B 122, 392 (2018) | |
Link: https://zoom.us/j/98197416231?pwd=c3ZnV0V6TDhsbkkwMnVDbTVWRG41dz09 |
16 Feb 2021
Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., MITP seminar room |
| Nick Evans, Southampton U. | |
I review arguments that chiral symmetry breaking is triggered when the quark bilinear condensate's dimension passes through one. This is supported by gap equations and more recently holographic models. Confinement may then be a separate property of the pure Yang-Mills theory below the scale of the dynamically generated quark mass, occurring at the scale of the pole in the deep IR running. Theories with more than one representation may have gaps between the condensation scales for the different representations with confinement below the lowest scale. Here, we use perturbative results for the running of the gauge coupling and gamma in asymptotically free SU(Nc) gauge theories with matter in higher dimension representations to seek the best candidate theories where confinement and chiral symmetry breaking can be maximally separated. | |
| at Zoom | |
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17 Feb 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Olena Gomonay, JGU | |
Seeing or listening: magnetoelastic effects in antiferromagnetic textures | |
| at Zoom and SPICE YouTube Channel | |
|
19 Feb 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Adam Sieradzan, University of Gdańsk, Poland | |
UNICORN: UNIfied COarse-gRaiNed model of biological macromolecules | |
| at Zoom | |
|
24 Feb 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Sergej Demokritov, University of Münster | |
Spatio-Temporal Dynamics of Magnon Bose-Einstein Condensates | |
| at Zoom and SPICE YouTube Channel | |
|
26 Feb 2021
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., None |
| Marina Guenza, Dept. of Chemistry and Biochemistry, University of Oregon, USA | |
The Integral Equation Theory of Coarse-Graining (IECG) and its applications. | |
| at zoom | |
|
03 Mar 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Ulrich Rößler, IFW Dresden | |
Improper Dyzaloshinskii spirals and metamagnetic textures - and where to look for them | |
| at Zoom and SPICE YouTube Channel | |
|
05 Mar 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 14:00 Uhr s.t., None |
| Frank Siebers, Institute of Physics, JGU | |
Dynamics of Light Driven Circle Walkers | |
| at Zoom | |
Master Colloquium |
10 Mar 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Theo Rasing, Radboud University | |
All-optical control of magnetism: from fundamentals to brain-inspired computing concepts | |
| at Zoom and SPICE YouTube Channel | |
|
17 Mar 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Henning Sirringhaus, University of Cambridge | |
Charge and Spin transport physics of organic semiconductors | |
| at Zoom and SPICE YouTube Channel | |
|
24 Mar 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Christian Back, TUM | |
Optical and Electrical Detection of Spin-Orbit Fields | |
| at Zoom and SPICE YouTube Channel | |
|
31 Mar 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Igor Mazin, George Mason University | |
Dynamic generation of scalar chirality and topological Hall effect in spiral magnets | |
| at Zoom and SPICE YouTube Channel | |
|
07 Apr 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Silvia Viola-Kusminskiy, MPL | |
Quantum magnonics: Quantum optics with magnons | |
| at Zoom and SPICE YouTube Channel | |
|
12 Apr 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Timo Graffe, Universität Mainz | |
Schüler Labor "Climate Escape" (in German) | |
| at Zoom for now | |
|
13 Apr 2021
Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., MITP seminar room |
| Raffaele Tito D'Agnolo, IPhT Saclay | |
I will discuss settings where the Higgs mass squared affects the vacuum expectation value of local operators and can thus act as a “trigger” of new cosmological dynamics. This triggering mechanism underlies several existing solutions to the hierarchy problem that trace the origin of the weak scale to the early history of the Universe. Thinking about these solutions more systematically from the point of view of weak scale triggers allows to understand their common predictions, to find new solutions and to identify unexpected physics related to naturalness in a rather model-independent way. As an example I discuss a BSM trigger in a Two Higgs Doublet Model and show how it can be used to link the tuning of the Higgs mass to that of the cosmological constant. This weak scale trigger demands the existence of new Higgs states necessarily comparable to or lighter than the weak scale, with no wiggle room to decouple them. | |
| at Zoom | |
|
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Hartmut Wittig und Martin Fertl, University of Mainz | |
The long-persisting discrepancy between the Standard Model prediction of the anomalous magnetic moment of the muon (aµ) and its latest measurement provides an intriguing hint to new physics. Since 2017, the Muon g − 2 Theory Initiative has assessed the theoretical
prediction for aµ, focusing on the contributions from the strong interaction, which account for the dominant part of the uncertainty. The latest estimate for the Standard Model prediction, which was published in a recent White Paper, has failed to resolve the discrepancy with the experimental measurement at Brookhaven National Laboratory, which stands at 3.7 standard deviations. At Fermi National Accelerator Laboratory, USA,
the Muon g-2 collaboration is performing a new measurement of aµ aiming at an ultimately fourfold smaller uncertainty than achieved with the predecessor experiment. To extract the value of aµ a clock comparison experiment is performed with spin-polarized muons confined
in a superbly controlled electric and magnetic field environment. The deviation of the Larmor from the cyclotron frequency, the anomalous spin precession frequency, is determined while a high-precision measurement of the magnetic field environment is performed using nuclear magnetic resonance techniques. We will provide an introduction to the current theory prediction before we will present and discuss the first results of the FNAL
experiment from its 2018 science run. | |
| at Recording of the presentation | |
|
14 Apr 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Thomas Speck, Johannes Gutenberg University | |
TBA | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Jörg Wunderlich, Regensburg University | |
Magneto-Seebeck microscopy of spin-orbit-torque driven domain wall motion in a collinear antiferromagnet | |
| at Zoom and SPICE YouTube Channel | |
|
15 Apr 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Peter Hommelhoff, Friedrich-Alexander-Universität Erlangen-Nürnberg | |
Free electrons are used in a plethora of instruments, ranging from electron microscopes to particle accelerators and modern light sources for decades. Yet, fundamentally new concepts are surfacing, taking advantage of electrons in an entirely new way, mainly based on quantum mechanical and nanophotonics concepts. In this talk, I will show recent results towards interaction-lean imaging with electrons and on-chip control of electrons. These results bring us closer to a quantum electron microscope and to a particle accelerator on a chip. | |
| at Zoom | |
|
19 Apr 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Vincent Roy, Universität Mainz | |
The Story of the Mainz Neutrino Mass Experiment | |
| at Zoom for now | |
|
SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie
SFB/TR49 - Prof. Dr. Elmers 16:00 Uhr s.t., None |
| Andrii Chumak, University of Vienna, Austria | |
Nano-Magnonics: From Room to Cryogenic Temperatures | |
| at Zoom | |
|
20 Apr 2021
Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., MITP seminar room |
| Xiaofeng Xu, Bern University | |
Canonical Feynman integrals are of great interest in the study of scattering amplitudes at the multi-loop level. We propose to construct d log-form integrals of the hypergeometric type, treat them as a representation of Feynman integrals, and project them into master integrals using intersection theory. This provides a constructive way to build canonical master integrals whose differential equations can be solved easily. We use our method to investigate both the maximally cut integrals and the uncut ones at one and two loops, and demonstrate its applicability in problems with multiple scales. | |
| at Zoom | |
|
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Mehran Kardar, Massachusetts Institute of Technology, Cambridge, USA | |
Affinity maturation (AM) is the process through which the immune system evolves antibodies (Abs) which efficiently bind to antigens (Ags), e.g. to spikes on the surface of a virus. This process involves competition between B-cells: those that ingest more Ags receive signals (from T helper cells) to replicate and mutate for another round of competition. Modeling this process, we find that the affinity of the resulting Abs is a non-monotonic function of the target (e.g. viral spike) density, with the strongest binding at an intermediate density (set by the two-arm structure of the antibody). We argue that, to evade the immune system, most viruses evolve high spike densities (SDs). An exception is HIV whose SD is two orders of magnitude lower than other viruses. However, HIV also interferes with AM by depleting T helper cells, a key component of Ab evolution. We find that T helper cell depletion results in high affinity antibodies when SD is high, but not if SD is low. This special feature of HIV infection may have led to the evolution of a low SD to avoid potent immune responses early on in infection. Our modeling also provides guides for design of vaccination strategies against rapidly mutating viruses. | |
| at Recording of the presentation | |
|
21 Apr 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Angelika Kühnle, Bielefeld University | |
TBA | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Chiara Ciccarelli, University of Cambridge | |
Spin transport in a conventional superconductor | |
| at Zoom and SPICE YouTube Channel | |
|
22 Apr 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Konrad Lehnert, JILA, University of Colorado, Boulder, USA | |
Can emerging quantum information technologies, in some way, improve or enhance searches for fundamental physical phenomena? Indeed, the use of optical squeezing in gravitational wave observatories is a beautiful example that they can. In addition to this one prominent example, the search for dark matter may offer several other near-term experiments that can, and perhaps must, use enhanced quantum sensing methods. In particular detail, I’ll discuss the case of searching for a hypothetical dark matter particle known as the axion and accelerating the search using quantum squeezing approaches. | |
| at Zoom | |
|
26 Apr 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Jan Weldert, Universität Mainz | |
Event reconstruction using likelihood-free inference | |
| at Zoom for now | |
|
27 Apr 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Jason Detwiler, University of Washington, USA | |
Neutrinos are known for their elusive nature due to their extremely small cross section for scattering off of individual nucleons inside
of nuclei. However they can also undergo billiard-ball-like coherent elastic scattering off of entire nuclei, with a greatly enhanced cross
section. This coherent elastic neutrino-nucleus scattering (CEvNS) is an important process in core-collapse supernovae, and can also be used
for astrophysical and terrestrial neutrino detection. The coherence of the interaction can also amplify potential non-standard interactions
between neutrinos and quarks, making it an ideal mode for testing as-yet unprobed physics beyond the Standard Model.
Although CEvNS was predicted in 1974, its first observation was only recently made in 2017 by the COHERENT collaboration, leveraging
decades of Dark Matter detector R&D that has yielded technologies with sufficient sensitivity to observe the ultra-faint nuclear recoils that
are the only signatures of the interaction's occurrence. COHERENT's discovery was also enabled by its nearly ideal pulsed source of
pion-decay neutrinos: the beam dump of the Spallation Neutron Source at Oak Ridge National Laboratory.
In this talk, I will discuss the physics of CEvNS and its challenging measurement. I'll describe COHERENT's first observation of CEvNS using
the world's first hand-held neutrino detector, a CsI scintillating crystal. I will then detail our more recent first observation of CEvNS
with argon using a scintillating volume of liquid Ar, including our updated sensitivity to non-standard neutrino interactions and other
physics. I'll also describe our plans to field two more detectors using NaI scintillating crystals as well as an array of germanium
radiation detectors, and our longer term plans to build multiple ton-scale experiments at a new beam stop with significantly improved
sensitivity. | |
| at Slides | |
|
28 Apr 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Ulrich Nowak, University of Konstanz | |
Spin dynamics: the Landau-Lifshitz equation and beyond | |
| at Zoom and SPICE YouTube Channel | |
|
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Javier Fuentes, JGU | |
Flavor anomalies in B decays | |
| at Zoom | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Pol Besenius, Johannes Gutenberg University | |
Surface Confined Supramolecular Polymerisation | |
| at Zoom | |
|
29 Apr 2021
Theoriekolloquium
Die Dozierenden der Theoretischen Physik 16:00 Uhr s.t., None |
| Joaquin Rodriguez-Nieva, Stanford University | |
TBA
Topic: Th. Kolloquium
Time: Apr 29, 2021 04:00 PM Amsterdam, Berlin, Rome, Stockholm, Vienna
Join Zoom Meeting
https://zoom.us/j/95899860316?pwd=dHBiREgyNnBOUml3QzNBSzUxZGJmQT09
Meeting ID: 958 9986 0316
Passcode: 090910 | |
| at Zoom | |
|
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Andreas Hemmerich, Institut für Laser-Physik, Universität Hamburg | |
I will review our recent research on time crystal dynamics in an atom-cavity system. In contrast to discrete time crystals in driven closed systems, where dissipation constitutes an undesired obstacle, I will discuss an ansatz, where tailored dissipation and fluctuations, induced via controlled coupling to a suitable environment, stabilize time crystal dynamics. The central signature in our implementation in a driven open atom-cavity system is a period doubled switching between distinct chequerboard density wave patterns, induced by the interplay between controlled cavity-dissipation, cavity-mediated interactions and external driving. We demonstrate the robustness of this dynamical phase against system parameter changes and temporal perturbations of the driving. | |
| at Zoom | |
|
30 Apr 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Maike Jung, Institute of Physics, JGU Mainz | |
Modeling Membrane Dynamics on the Level of Organelles | |
| at Zoom | |
|
04 May 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Gia Dvali, Max Plank Institute of Physics, Munich | |
Understanding the origin of hierarchies is one of the main driving forces of today's fundamental research. The well-known examples are provided by the hierarchy between the weak and Planck scales, the hierarchy between neutrino and electron masses and the hierarchy between the Planck scale and the vacuum energy of the present Universe. Sometimes these puzzles are classified as so-called ``naturalness problems". Historically, in the case of proton/pion mass hierarchy, such questions led to advances that changed modern particle physics.
In this talk we review certain representative examples when the hierarchy can be taken as a serious indication for new physics. We also review cases when a seeming naturalness problem is nullified by consistency of the theory. We give an example of the celebrated naturalness puzzle of the cosmological term. This however turns out to be fictitious, since the consistency of the S-matrix formulation demands that the cosmological constant is excluded from the energy budget of our Universe. | |
| at Recording of the presentation | |
|
Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Admir Greljo, Bern U. | |
Recent R(K) update from the LHCb experiment at CERN reinforced the tension of B-meson decays into muons. Shortly after, the Muon g-2 experiment at Fermilab strengthened the tension in the muon anomalous magnetic moment. Immense theoretical and experimental work is still needed to possibly establish the existence of new physics, nonetheless, we can already ask relevant questions. Can muon anomalies be coherently addressed in models beyond the SM, and if so, where else should we look for confirmation? I will discuss minimal extensions of the SM based on 2103.13991. | |
| at Zoom | |
|
05 May 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., via Zoom |
| Markus Mezger, University of Vienna, MPI-P | |
X-ray and Neutron Scattering Techniques for Soft Matter | |
|
06 May 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Ignacio Cirac, Max-Planck-Institut für Quantenoptik, Garching | |
Quantum many-body systems are very hard to simulate, as computational resources (time and memory) typically grow exponentially with system size. However, quantum computers or analog quantum simulators may perform that task in a much more efficient way.
In this talk, I will first review some of the quantum algorithms that have been proposed for this task and then explain the advantages and disadvantages of analog quantum simulators. I will also describe theoretical proposals to solve different quantum simulation problems with cold atoms in optical lattices. | |
| at Zoom | |
|
11 May 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Achim Stahl, RWTH Aachen, Germany | |
Gravitational waves opened a new window into the universe. The current generation of gravitational wave detectors
demonstrated the existence of gravitational waves and made a number of highly interesting discoveries. In parallel with
their operation we are developing a new generation of telescopes with a sensitivity goes beyond the final sensitivity
of the current telescopes by at least an order of magnitude. The Einstein Telescope will be the European project of the
new generation. After an introduction of gravitational waves and a few highlights from the current observation runs,
I will discuss the perspectives and technologies necessary to improve their performance. I will introduce the Einstein
Telescope and present a few example of the science we might expect | |
| at Recording of the presentation | |
|
Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Lorenzo Ubaldi, SISSA, Trieste | |
A scalar inflaton coupled to a dark photon can produce a large density of the latter. I will discuss the mechanism underlying this production, which takes place mostly at the end of inflation. After reheating, the dark photons are relativistic at first and then redshift to non relativistic. Their energy density today can match that of the observed dark matter in a wide region of parameters of the model. It is interesting to study in detail also the dark photon power spectrum and its cosmic evolution, which predicts a clumpy nature of this dark matter candidate, possibly useful for experimental searches. | |
| at Zoom | |
|
12 May 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Michael Kappl, MPI-Polymer Research | |
Supraparticles from superomniphobic surfaces | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Ulrich Nowak, Konstanz University | |
Spin dynamics: the Landau-Lifshitz equation and beyond | |
| at Zoom and SPICE YouTube Channel | |
|
17 May 2021
SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie
SFB/TR49 - Prof. Dr. Elmers 16:00 Uhr s.t., None |
| Jeffrey McCord, Kiel University | |
Magnetic domain behavior in high sensitivity magnetic field sensors – magnetic noise and magnetic domain control | |
| at Zoom | |
|
18 May 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Kathrin Valerius, Karlsruher Institute of Technology, Germany | |
News on the Neutrino-Mass Measurement | |
| at Recording of the presentation | |
|
Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., MITP seminar room |
| Florian Goertz, Max-Planck-Institut für Kernphysik, Heidelberg | |
In this talk, we present a minimal viable scenario that unifies the gauge symmetries of the SM and their breaking sector. Our Gauge-Higgs Grand Unification setup employs 5D warped space with a SU(6) bulk gauge field that includes both a SU(5) grand unified theory (GUT) and a Higgs sector as a scalar component of the 5D vector field, solving the hierarchy problem. By appropriately breaking the gauge symmetry on the boundaries of the extra dimension the issue of light exotic new states, appearing generically in such models, is eliminated and the SM fermion spectrum is naturally reproduced. The Higgs potential is computed at one-loop, finding straightforward solutions with a realistic mh = 125 GeV. The problem of proton decay is addressed by showing that baryon number is a hidden symmetry of the model. The presence of a scalar leptoquark and a scalar singlet is highlighted, which might play a role in solving further problems of the SM, allowing for example for electroweak baryogenesis. Finally, the X and Y gauge bosons from SU(5) GUTs are found at collider accessible masses, opening a window to the unification structure at low energies. | |
| at Zoom | |
|
19 May 2021
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Iwona Grabowska-Bold, Krakow | |
The Large Hadron Collider (LHC) is capable of accelerating proton and nucleus beams to ultra-relativistic velocities and provides collisions at unprecedented center-of-mass energy. The physics programme spans from precision measurements of processes predicted by the Standard Model (SM), through searches and tests of multiple theories beyond SM to studies of the quark-gluon plasma - a deconfined state of quarks and gluons. Although, most of the year the LHC collides proton beams, it also provides heavy-ion (HI) collisions. All four experiments, ALICE, ATLAS, LHCb and CMS, have HI physics programmes established based on lead-lead, proton-lead, and reference proton-proton collisions. In this talk basic concepts of ultra-relativistic HI physics will be introduced. Physics opportunities with two extreme categories of centrality classes (central and ultra-peripheral) will be discussed. The selection of recent measurements from ALICE, ATLAS, CMS and LHCb experiments will be reviewed. A talk will be concluded with a brief discussion of the future HI data taking. | |
| at Zoom | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Arash Nikoubashman, Johannes Gutenberg University | |
Watching paint dry: Structure formation in drying films and droplets | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Karin Everschor-Sitte, JGU | |
Magnetic skyrmions for unconventional computing and revealing latent information | |
| at Zoom and SPICE YouTube Channel | |
|
20 May 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Ralf Röhlsberger, Helmholtz Institut Jena/Friedrich-Schiller Universität Jena | |
The remarkable development of accelerator-driven light sources such as synchrotrons and X-ray lasers with their highly brilliant X-rays has brought quantum and nonlinear phenomena at X-ray energies within reach. X-ray photonic structures like cavities and superlattices are employed as new laboratory to realize quantum optical concepts at x-ray energies. The prime candidates to be chosen as atomic emitters in this field are Mössbauer isotopes. Their extremely small resonance bandwidth facilitates to probe fundamental phenomena of the light-matter interaction like the observation of single-photon superradiance and the collective Lamb shift as well as electromagnetically induced transparency with nuclei. Employing higher-order coherences of x-ray fields in the spirit of Glauber could even lead to novel concepts for quantum imaging at x-ray energies. | |
| at Zoom | |
|
26 May 2021
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Gilad Perez, Weizmann Institute | |
Beyond standard model theory in AMO | |
| at Zoom | |
|
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Kurt Kremer, MPI-Polymer Research | |
Introduction to Multiscale Modeling of Polymers | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| James G. Analytis, Berkeley | |
Antiferromagnetic Switching Driven by the Collective Dynamics of Correlated Spin Textures | |
| at Zoom and SPICE YouTube Channel | |
|
27 May 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Dr. Christian Sanner, JILA, University of Colorado, Boulder, USA | |
Can Fermi quantum statistics be used to manipulate the radiative properties of atomic emitters? Is it possible to extend the natural lifetime of an electronically excited atom by placing it inside a bath of quantum-degenerate ground-state atoms? I will report on an experiment that demonstrates how a Fermi sea can block the spontaneous decay of an excited atom. This striking manifestation of Fermi statistics connects for the first time the fundamental radiative property of atoms to their motional degrees of freedom subject to quantum statistics. Quantum engineering the atom-photon coupling opens up new perspectives for optical clocks, which face spontaneous decay as a fundamental decoherence mechanism. | |
| at Zoom | |
|
31 May 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Manuel Hohmann, Institut für Physik | |
Performance of Forward Electrons with the ATLAS Experiment in LHC Run 2 | |
| at Zoom for now | |
|
01 Jun 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Katia Parodi, University of Munich, Germany | |
High Precision Ion Therapy | |
| at Attachement | |
|
02 Jun 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Nathalie Katsonis, University of Groningen, The Netherlands | |
Motile behaviour of supramolecular systems | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Giovanni Finocchio, University of Messina | |
Spintronic microwave and THz detectors: state-of-the art and future! | |
| at Zoom and SPICE YouTube Channel | |
|
08 Jun 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Jens Erler, University of Mainz | |
Half a century ago the foundations underpinning the gauge theories of the strong, weak and electromagnetic interactions had been laid out, and the age of precision calculations for its tests and the determination of its parameters could begin. We recall some of the history with an emphasis on the role played by electroweak precision tests. While in the past theoretical ideas have often preceded experimental discoveries, the years and decades ahead of us are in desperate need of experimental guidance. | |
| at Zoom | |
|
Theorie-Palaver
Institut für Physik 17:30 Uhr s.t., MITP seminar room |
| Ben Safdi, Berkeley | |
The quantum chromodynamics axion and axion-like particles are some of the most sought-after beyond the Standard Model particles at present because of their possible connections with the strong-CP problem, dark matter, and ultraviolet physics such as Grand Unification and String Theory. Laboratory searches are underway around the world to search for these hypothetical particles, but certain regions of axion parameter space -- such as ultralight axions with weak couplings to matter -- are notoriously difficult to probe with terrestrial experiments, despite their theoretical motivations. However, axions in this part of the parameter space may be produced in abundance within compact stars such as white dwarfs and neutron stars. It has long been recognized that axion production in compact stars opens up a new pathway for them to cool. I will point out, however, that axions may also lead to novel X-ray signatures around these stars, whereby the axions are produced within the stellar cores and then convert to photons in the strong magnetic fields surrounding the stars. I will discuss recent data taken by the XMM-Newton and Chandra telescopes from nearby neutron stars and white dwarfs that provide some of the strongest probes to-date of axions by searching for these processes. | |
| at Zoom | |
|
09 Jun 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Regine von Klitzing, Technical University of Darmstadt | |
Different kinetic pathways how to dope polymer brushes with Gold-nanoparticles | |
| at Zoom | |
|
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Sangeeta Sharma, Max-Born-Institute | |
Ultrafast coupled charge, spin and nuclear dynamics: ab-initio description | |
| at Zoom and SPICE YouTube Channel | |
|
Theoriekolloquium
Die Dozierenden der Theoretischen Physik 16:00 Uhr s.t., Newton-Raum, Staudinger Weg 9, 01-122 |
| Javier Argüello Luengo, ICFO | |
Topic: Th. Kolloquium
Time: Jun 9, 2021 04:00 PM Amsterdam, Berlin, Rome, Stockholm, Vienna
Join Zoom Meeting
https://zoom.us/j/94144055619?pwd=RWJyZE9yVm10K3VnajhIQVNGS1Y1UT09
Meeting ID: 941 4405 5619
Passcode: 090909
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| at Zoom | |
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10 Jun 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Dr. Ana Maria Rey, JILA, NIST and University of Colorado, Boulder, USA | |
I will discuss recent progress on the use of planar crystals with hundreds of ions as a platform for quantum simulation of spin and spin-boson models. The key idea is the use of a pair of lasers to couple two internal levels of the ions, that act as a spin½ degree of freedom, to the vibrational modes, phonons, of the crystal. In the regime when phonons do not play an active role in the dynamics and instead mediate spin-spin interactions we have been able to simulate Ising models with tunable-range spin couplings, and a many-body echo sequence, which we used to measure out-of-time-order correlations (OTOCs), a type of correlations that quantify the scrambling of quantum information across the system’s many-body degrees of freedom. In the regime when phonons actively participate we have been able to simulate the Dicke model, an iconic model in quantum optics which describes the coupling of a (large) spin to an oscillator and more recently realize a many-body quantum-enhanced sensor that can detect weak displacements and electric fields. Our system is the first to demonstrate an enhanced sensitivity resulting from quantum entanglement in a mesoscopic ion crystal with an improvement by a factor of 300 over prior classical protocols in trapped ions and more than an order of magnitude compared to state-of-the-art electrometers based on Rydberg atoms. Overall my talk plans to illustrate the great potential offered by trapped ion crystals not only as quantum simulators but also as feasible near-term detectors of dark matter. | |
| at Zoom | |
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11 Jun 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Joseph F Rudzinski, MPIP, Mainz | |
Coarse-graining with forces: Towards graph neural network coarse-grained models | |
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14 Jun 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Alec Lindman, Institut für Physik | |
Atomic Source Measurements for Project 8 | |
| at Zoom for now | |
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15 Jun 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Helmut Satz, University of Bielefeld, Germany | |
In recent years, the study of swarm formation and structure has become a challenging field of research
in which biology and physics overlap. It was shown that mathematical models of many identical
components subject to simple interactions produce behavior patterns similar to those of swarms, as
observed in high statistics measurments of starling flocks in Rome by the EU Starflag collaboration.
Swarm behavior thus is an instance of selforganisation - there is no leader or formation plan. | |
| at Recording of the presentation | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Matthew Reece, Harvard U. | |
This talk will take the form of two mini-talks, which are loosely related in that both involve axion (or ALP) fields. First, I will discuss challenges when fitting the muon g-2 anomaly with axion-like fields in an EFT setting. I will argue that new particles are required near the weak scale to UV complete these models, and these are subject to experimental constraints and can also affect the muon g-2 directly. This is based on arXiv:2104.03267 with Manuel Buen-Abad, JiJi Fan, and Chen Sun. Second, I will discuss how axions interacting with abelian gauge fields acquire a potential through a nonperturbative, semiclassical effect involving loops of monopoles and dyons. This is an application of the Witten effect. This is based on arXiv:2105.09950 with JiJi Fan, Katie Fraser, and John Stout. | |
| at Zoom | |
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16 Jun 2021
PRISMA Colloquium
Institut für Physik 13:00 Uhr s.t., None |
| Matteo Cadeddu, INFN Cagliari | |
Coherent elastic neutrino scattering and constraints for the neutron skin | |
| at Zoom | |
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GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Sigi Waldvogel, Johannes Gutenberg University | |
Electrifying Organic Synthesis | |
| at Zoom | |
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SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Andrew Kent, New York University | |
Electrical Generation of Spin Currents | |
| at Zoom and SPICE YouTube Channel | |
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17 Jun 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Dr. Silvia Viola-Kusminskiy, Max-Planck-Institute for the Science of Light, Erlangen | |
In the last few years, a new field has emerged at the intersection between Condensed Matter and Quantum Optics, denominated “Quantum Magnonics”. This field strives to control the elementary excitations of magnetic materials, denominated magnons, to the level of the single quanta, and to interface them coherently to other elementary excitations such as photons or phonons. The recent developments in this field, with proof of concept experiments such as a single-magnon detector, have opened the door for hybrid quantum systems based on magnetic materials. This can allow us to explore magnetism in new ways and regimes, has the potential of unraveling quantum phenomena at unprecedented scales, and could lead to breakthroughs for quantum technologies. A predominant role in these developments is played by cavity magnonic systems, where an electromagnetic cavity, either in the optical or microwave regime, is used to enhance and control the interaction between photons and magnons. In this talk, I will introduce the field and present some theoretical results from our group which aim to push the boundaries of the current state of the art. | |
| at Zoom | |
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18 Jun 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Maarten Brems, Institute of Physics, JGU Mainz | |
Skyrmion Token-Based Computing Using Artificially Induced Diffusion | |
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21 Jun 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Quirin Weitzel and Steffen Schönfelder, Prisma Detector Lab | |
3D-Printing Technologies and Possibilities in the PRISMA Detector Lab | |
| at Zoom for now | |
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SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie
SFB/TR49 - Prof. Dr. Elmers 16:00 Uhr s.t., None |
| Felix Tuczek, Christian-Albrechts-Universität zu Kiel | |
Spin-state switching of iron complexes adsorbed on surfaces | |
| at Zoom | |
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22 Jun 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Horst Geckeis, Karlsruher Institute of Technology, Germany | |
Endlagerstätten in Deutschland | |
| at Recording of the presentation | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Keri Vos, Maastricht U. and Nikhef | |
The determination of the CKM element Vcb from inclusive semileptonic b → c semileptonic decays has reached a high precision thanks to a combination of theoretical and experimental efforts. Moreover, the long standing Vcb puzzle, a discrepancy between inclusive and exclusive determinations seems to be disappearing. In this talk, I will discuss the story of Vcb and how to continue towards even higher precision focussing on the inclusive determination. Specifically, I discuss two new strategies to improve the precision. The first is based on reparametrization invariances, which allows including higher power-suppressed terms in the heavy-quark expansion (HQE), the second is a method to control background effects using the HQE. | |
| at Zoom | |
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23 Jun 2021
PRISMA Colloquium
Institut für Physik 17:00 Uhr s.t., None |
| Svetlana Barkanova, Yury Kolomensky, Aleksandrs Aleksejevs, Ben Sheff, Memorial University, University of California Berkley, Memorial University, University of Michigan | |
please note different time! | |
| at Zoom | |
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GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Sebastian Seiffert, Johannes Gutenberg University | |
Thermoresponsive Hydrogels for Energy-Autonomous Seawater Desalination | |
| at Zoom | |
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SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Vincent Baltz, SPINTEC | |
Spin And Charge Transport in Antiferromagnets | |
| at Zoom and SPICE YouTube Channel | |
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24 Jun 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Georg von Freymann, Technische Universität Kaiserslautern | |
Terahertz spectroscopy has evolved over recent years from an interesting but technologically hard to address tool for fundamental studies to a technology with industrial applications. Closing the so-called terahertz gap is nowadays possible with ultrafast lasers from the optical side as well as with millimeter-wave-technology from the electronic side. After a brief review of the state-of-the-art I will focus on recent progress on terahertz cross-correlation-spectroscopy driven by a superluminescent light emitting diode and terahertz spectroscopy with undetected photons for which all terahertz spectral information is gained from visible photons. | |
| at Zoom | |
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25 Jun 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Riccardo Martina, Department of Physics, University of Padua and Institute of Physics, JGU Mainz | |
A machine learning potential for nucleotides in water | |
| at Zoom | |
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29 Jun 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Norbert M. Linke, Joint Quantum Institute and Department of Physics, University of Maryland, College Park, MD 20742, USA | |
Trapped ions give us a high degree of detailed control of their various quantum degrees of freedom, which has enabled a large number of experiments in quantum optics, quantum computing, simulation and networking as well as precision metrology and others. We present a quantum architecture consisting of a linear chain of trapped 171 Yb+ ions with individual laser beam addressing and readout. The collective modes of motion in the chain are used to efficiently produce entangling gates between any qubit pair. In combination with a classical software stack, this becomes in effect an arbitrarily programmable fully connected quantum computer. Over the past five years, we have employed this experiment to demonstrate a variety of quantum algorithms with the help of a community of academic partners, including cross-hardware comparisons with commercially developed systems and digital quantum simulations of models from high-energy physics and other areas. We also use the same level of control to study interesting quantum phenomena using the motional degrees of freedom directly, such as exotic para particles and Hubbard models of phonons. This talk will give recent highlights from both of these approaches and discuss improvements in trap technology for scaling up as well as other ideas for the future. | |
| at Recording of the presentation | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., MITP seminar room |
| Martin Winkler, Texas U. and Stockholm U. | |
I will introduce Chain inflation as an alternative to slow roll inflation in which the universe undergoes a series of transitions between different vacua. The role of the inflaton can be played by an axion which tunnels from minimum to minimum in a quasiperiodic potential. I will determine the scalar power spectrum of chain inflation and show that it is fully consistent with a ΛCDM cosmology. Then I will turn to the Hubble tension, the apparent discrepancy between local measurements of the Hubble constant H0=74 km/s/Mpc and H0=67 km/s/Mpc inferred from the CMB. I will propose Chain Early Dark Energy - the low-energy analog of chain inflation - as a solution of the H0-tension and point to a connection to today's dark energy. | |
| at Zoom | |
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30 Jun 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Jens-Uwe Sommers, Leibniz Institute of Polymer Research, Dresden | |
Theory of chain walking catalysis: From dendritic to bottle brush molecules | |
| at Zoom | |
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SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Katharina Franke, FU Berlin | |
Building and investigating magnetic adatom chains on superconductors atom by atom | |
| at Zoom and SPICE YouTube Channel | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., Hörsaal 20 (Geb. 1 231, J.-J.-Becher Weg 14) |
| Gilly Elor, University of Washington | |
I will introduce a class of new mechanisms for low-scale baryogenesis and dark matter production that utilize the CP violation within Standard Model meson systems. Mesogenesis mechanisms operate at MeV scales and such, remarkably, are experimentally testable. I will first give an overview of B-Mesogenesis; in which baryogenesis proceeds through the oscillation and subsequent decay into a dark sector of neutral B mesons. B-Mesogenesis is testable at current hadron colliders and B-factors, and I will present results of recent studies that pave the way towards constraining (or discovering) this mechanism. Finally, I will present a recent proposal for D-Mesogenesis which relies on the CP violation of charged D mesons. | |
| at Zoom | |
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01 Jul 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Dr. Sven Herrmann, ZARM, Universität Bremen | |
Following the accidental injection of the European GNSS satellites Galileo 5 and 6 into eccentric orbits in 2014, our group, as well as a second independent team, managed to use these satellites for a test of the general relativistic gravitational redshift. This was based on an analysis of three years of orbit and clock data from the Passive Hydrogen Masers on board of these satellites. In this talk I will present some aspects of this test of relativity and discuss also more recent progress on this topic in general. | |
| at Zoom | |
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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., None |
| M. Lisa Manning, Department of Physics Physics, Syracuse University, New York, USA | |
TBA | |
| at Zoom | |
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02 Jul 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Paul Sonek, Institute of Physics, JGU Mainz | |
TBA | |
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05 Jul 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Christian Matthé, Universität Mainz | |
Wire detector for atomic hydrogen beam monitoring | |
| at Zoom for now | |
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06 Jul 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Ken Carslaw, University of Leeds, Great Britain | |
Clouds containing a mixture of ice and supercooled water are expected to become more reflective in a warmer world as the ice is increasingly replaced by water. This response causes a negative “cloud-phase” climate feedback that acts to dampen global warming. In this presentation I will show that quantification of this cloud response hinges on understanding the properties of the rare particles that initiate ice formation – ice-nucleating particles. I will show results from modelling and observations that demonstrate the importance of these particles for cloud reflectivity. Substantial recent developments in our understanding of ice-nucleating particles from laboratory and field measurements now enable us to build reasonable global models of their distribution and to determine which properties matter for climate change. | |
| at Zoom | |
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Theorie-Palaver
Institut für Physik 14:30 Uhr s.t., None |
| Tevong You, CERN | |
We describe a new phenomenon in quantum cosmology: self-organised localisation. When the fundamental parameters of a theory are functions of a scalar field subject to large fluctuations during inflation, quantum phase transitions can act as dynamical attractors. As a result, the theory parameters are probabilistically localised around the critical value and the Universe finds itself at the edge of a phase transition. We illustrate how self-organised localisation could account for the observed near-criticality of the Higgs self-coupling, the naturalness of the Higgs mass, or the smallness of the cosmological constant. | |
| at Zoom | |
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07 Jul 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Hans-Jürgen Butt, MPI-Polymer Research | |
Progress in understanding wetting | |
| at Zoom | |
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SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Philipp Pirro, TUK | |
Neuromorphic magnon-spintronic networks | |
| at Zoom and SPICE YouTube Channel | |
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08 Jul 2021
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Hiroshi Kawarada, School of Fundamental Science and Engineering, Waseda University, Japan | |
With heavily boron doping (1022 cm-3 , ~6% ) diamond [1,2] exhibits type II superconducting with Tc offset>10K. Its high upper critical field which is estimated to be H2(0) = 11.5 T [3]. These diamonds are produced from gas phase such as CH4, CO2 with the addition of boron during plasma assisted chemical vapor deposition. Boron behaves as acceptor in diamond lattice as it does in Si and changes semiconducting diamond to metallic diamond in the degenerated semiconductor. We have demonstrated diamond superconducting quantum interference device (SQUID) has been demonstrated [4,5]. SQUID is a sensor for extremely small magnetic field used in material science, medical equipment, mineral exploration. In addition, it has also been used in qubit. Especially in Xmon qubit [6] which is a kind of transmon qubit [7] used for quantum computer. It is an important component enabling to tune qubit frequency. General problems with SQUID's materials are temperature change, natural oxidation, and deterioration due to collision. Hence, we have fabricated a highly robust SQUID Among such demonstrations, the SQUID composed of the trench-type or step-type Josephson junctions (JJs), which were formed in the boundary of discontinuous (111) sectors, operated at 10 K above liquid helium temperature (4.2 K) [5]. Unlike the previous structure included (001) surface (Tc < 4.2 K) [4], these trench or step-type JJs were composed of only (111) surface (Tc = 10K) [1,4]. At present Vp-p=47.7 μV at 1.6 K is the highest value in diamond SQUIDs.
One of the unique properties of diamond is the close coexistence of superconductivity and two-dimensional Hall gas (2DHG) in a transistor structure [8]. 2DHG diamond field effect transistors (FETs) exhibit high power microwave operation [9]. All diamond Josephson (Jo) FET that exhibits gate control on the Josephson coupling ultimately leads to the realization of electrically tunable transmon qubits [10] (gatemon).
[1] A. Kawano HK et al. Phys. Rev. B,82 (2010) 085318
[2] M.Watanabe, HK, Phys. Rev. B,85 (2012) 184516
[3] T. Kageura, HK et al., Diamond and Related Materials 90 (2018) 181.
[4] T. Kageura, HK et al., Sci. Rep. 9, (2019) 15214
[5] A. Morishita, HK et al., Carbon 181, (2021) 379.
[6] R. Barends, C. Neill et al., Phys. Rev. Lett. 111 (2013) 080502.
[7] J. Koch, R.J. Schoelkopf et al., Phys. Rev A 76 (2007) 042319.
[8] S. Imanishi HK et al. IEEE Elec. Dev. Lett. 42 (2021) 204.
[9] S. Imanishi HK et al. IEEE Elec. Dev. Lett. 40 (2019) 279.
[10] T..Larsen, C. M. Marcus et al. Phys. Rev. Lett. 115 (2015) 127001. | |
| at Zoom | |
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09 Jul 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Thomas Kühne, Department of Chemistry, University of Padeborn | |
In silico design of sustainable systems | |
|
12 Jul 2021
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum |
| Birte Sauer, Institut für Physik | |
Measurement of the anomalous magnetic moment of tau leptons using ATLAS data | |
| at Zoom for now | |
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SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie
SFB/TR49 - Prof. Dr. Elmers 16:00 Uhr s.t., None |
| Silvia Tacchi, Istituto Officina dei Materiali - IOM | |
Reconfigurable magnonics based on spin textures | |
| at Zoom | |
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13 Jul 2021
Physikalisches Kolloquium
Institut für Kernphysik, Remote Seminar 16:15 Uhr s.t., None |
| Nick Hutzler, Caltech, California Institute of Technology, USA | |
The fact that the universe is made entirely out of matter, and contains no free anti-matter, has no physical explanation.
The unknown process that created matter in the universe must violate a number of fundamental symmetries, including those that forbid the
existence of certain electromagnetic moments of fundamental particles whose signatures are amplified by the large internal fields in polar
molecules. We discuss spectroscopic and theoretical investigations into polyatomic molecules that uniquely combine multiple desirable
features for precision measurement, such as high polarizability through symmetry-lowering mechanical motions, novel electronic and
bonding structures, laser cooling, and exotic nuclei. | |
| at Zoom | |
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14 Jul 2021
GRK 2516 Soft Matter Seminar
Uni Mainz 10:30 Uhr s.t., None |
| Friederike Schmid, Johannes Gutenberg University | |
Field based simulations for soft matter | |
| at Zoom | |
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SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Christian Pfleiderer, TU Munich | |
Topological protectorates of Fermi surfaces | |
| at Zoom and SPICE YouTube Channel | |
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15 Jul 2021
Theoriekolloquium
Die Dozierenden der Theoretischen Physik 16:00 Uhr s.t., Newton-Raum, Staudinger Weg 9, 01-122 |
| Francesco Piazza, MPIPKS - Dresden | |
TBA
Topic: Th. Kolloq.
Time: Jul 15, 2021 04:00 PM Amsterdam, Berlin, Rome, Stockholm, Vienna
Join Zoom Meeting
https://zoom.us/j/94666378028?pwd=OThVejk4bHF6WkhQRU9LaWV2VWNzUT09
Meeting ID: 946 6637 8028
Passcode: 090910 | |
| at Zoom | |
|
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., None |
| Prof. Dr. Stefan Filipp, Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften | |
The rapid development of quantum technologies in the recent past has brought us a step closer to operational quantum computers that hold promise to outperform conventional computers in certain types of problems. While a large number of qubits is necessary to run complex algorithms, fast and high-fidelity gate operations of different types are as important. We utilize a system based on fixed-frequency superconducting qubits that are characterized by their stability, relatively long coherence times and scalability. On this platform we explore different ways to increase the performance of future quantum processors. We demonstrate that optimal control techniques allow us to shape microwave control pulses and realize fast single-qubit pulses without sacrificing their fidelity. Furthermore, we explore measurement techniques with a high duty cycle to overcome the challenge of time-consuming optimization sequences. For the generation of entangled two-qubit states we make use of a parametrically driven tunable coupler and implement different types of gates. Since exchange-type gates preserve the number of qubit excitations these are particularly well suited for quantum chemistry algorithms in which the number of electrons in the molecule is typically fixed. With this choice of gates we can make best use of the available hardware and realize short algorithms that finish within the coherence time of the system. With gate fidelities around 95% we compute the eigenstates within an accuracy of 50 mHartree on average, a good starting point for near-term applications with scientific and commercial relevance. | |
| at Zoom | |
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Emergent AI Center Seminars
JGU Research Center for Algorithmic Emergent Intelligence 14:00 Uhr s.t., Online |
| ADVAIT MADHAVAN, University of Maryland, National Institute of Standards and Technology | |
TBA | |
| at Zoom | |
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16 Jul 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Martin Hanke-Bourgeois, Department of Mathematics, JGU Mainz | |
The Lanczos method | |
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21 Jul 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Shunsuke Fukami, Tohoku University | |
Electrical manipulation of non-collinear antiferromagnet | |
| at Zoom and SPICE YouTube Channel | |
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28 Jul 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Alexander Mook, University of Basel | |
Interacting and higher-order topological spin excitations | |
| at Zoom and SPICE YouTube Channel | |
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01 Sep 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Benedetta Flebus, Boston College | |
Magnetic topological phases in dissipative systems | |
| at Zoom and SPICE YouTube Channel | |
|
08 Sep 2021
Emergent AI Center Seminars
JGU Research Center for Algorithmic Emergent Intelligence 12:00 Uhr s.t., Online |
| Dr. Sara Vieira-Silva, Laboratory of Molecular Bacteriology (Rega Institute), KU Leuven, Belgium | |
Sara Vieira-Silva's main research interests are the boundaries of the healthy human gut microbiota variation and the role of dysbiosis in disease, especially through the promotion of inflammation and production/degradation of bioactive compounds. She combines her background in microbial comparative genomics and evolutionary ecology, with hypothesis-driven experimental design. In close collaboration with clinical experts, she approaches quantitatively the contribution of host-associated microbial communities to pathophysiology, notably in the clinical context of inflammatory, metabolic and neuropsychiatric disorders. | |
| at Zoom | |
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15 Sep 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Katja Nowack, Cornell University | |
Local magnetic measurements of quantum materials | |
| at Zoom and SPICE YouTube Channel | |
|
aktuell
22 Sep 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Jack Nathaniel Carter-Gartside, Imperial College London | |
Reconfigurable Training, Vortex Writing and Noise-Tolerant Reservoir Computation via Spin-Wave Fingerprinting in an Artificial Spin-Vortex Ice | |
| at Zoom and SPICE YouTube Channel | |
|
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., None |
| Daniela Janka Bauer, Computer Science, JGU Mainz | |
Phase Behavior of Intrinsically Disordered Proteins | |
| at MS Teams | |
|
zukünftige Termine
24 Sep 2021
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau 10:30 Uhr s.t., None |
| Prof. Dr. David Landau, Center for Simulational Physics, The University of Georgia, Athens, GA, U.S.A. | |
Effects of Lattice Constraints on Folding in the Semi-Flexible H0P Protein Model: A Wang-Landau Study | |
| at Zoom | |
|
28 Sep 2021
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 |
| Yannick Witzky, Institut für Phisik | |
TBA | |
|
13 Oct 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Markus Garst, KIT | |
tba | |
| at Zoom and SPICE YouTube Channel | |
|
27 Oct 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Kirsten von Bergmann, Hamburg University | |
tba | |
| at Zoom and SPICE YouTube Channel | |
|
24 Nov 2021
SPICE-Spin+X Seminar
TUK and JGU 15:00 Uhr s.t., None |
| Hariom Jani, NUS | |
tba | |
| at Zoom and SPICE YouTube Channel | |
|