Jahresübersicht für das Jahr 2024
09 Jan 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Markus Roth, TU Darmstadt | |
With the recent demonstration of fusion ignition and burn and the first energy gain from controlled fusion reactions, the laser-based fusion approach has become a promising concept for fusion energy. While not supported in Germany until a few years ago, Germany has a huge potential in taking the lead on laser-fusion research, based on its excellent science and technology in optics and lasers.
Focused Energy is a US/German Startup company, spin-off of the TU Darmstadt that has gathered the world experts in laser fusion in the last two years.
I will review the recent results at the Lawrence Livermore National Laboratory National Ignition Facility and sketch a pathway from this groundbreaking result to a first fusion reactor prototype. Slides here... | |
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Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:00 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Zeno Capatti, U. Bern | |
In this talk, I will review the main aspects of three-dimensional approaches to the computation of Feynman diagrams and of the Local Unitarity formalism. I will start by discussing the Cross-Free Family representation, which allows for a systematic analysis of the singularities of Feynman diagrams. I will then introduce the Local Unitarity framework, in which interference diagrams are combined, through a generally-applicable mapping of the phase-space measure, to give locally finite cross-sections. Finally, I will discuss the extension of the Local Unitarity formalism to processes with initial state singularities, which will allow me to discuss the role of spectator particles and higher-multiplicity initial-state partonic configurations in the cancellation and factorisation of singularities. | |
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10 Jan 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Andrea Caputo, CERN, Switzerland | |
All the burning questions of the Standard Model such as the origin of dark matter, of the matter antimatter asymmetry, of neutrino masses, seem to invoke the presence of other, “dark” particles. But how do we look for these new particles? In this talk I advocate for the use of astrophysical objects as a laboratory to make progress on these puzzles. In particular, the referent will describe some ideas to use Supernovae and galaxy observations with line intensity mapping to shed some light on this darkness and probe motivated models such as axion-like particles, dark photons, light CP-even scalars. This effort is very timely, as it coincides with a broad set of astrophysical and cosmological observations becoming available now and in the near future. | |
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11 Jan 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Stefan Eriksson, Department of Physics, Faculty of Science and Engineering, Swansea University, UK | |
Precision measurements of the properties of trapped antihydrogen offer stringent tests of fundamental principles underlying particle physics and general relativity, such as Lorentz and CPT invariance and the Einstein Equivalence Principle. In this presentation I will give an overview of the ALPHA antihydrogen experiment at CERN including recent results from spectroscopy and observations of the effect of gravity. I will review how results are interpreted as tests of fundamental physics with a discussion of how a hypothetical CPT violation could result in matter-antimatter asymmetry. I will give an outline of the prospects for future high-precision spectroscopy, free-fall and gravitational redshift experiments with antihydrogen. | |
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15 Jan 2024
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Johann Martyn, Institut für Physik | |
Deployment of Water-based Liquid Scintillator in ANNIE | |
| at https://indico.him.uni-mainz.de/event/199/ | |
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16 Jan 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Marco Durante, GSI Helmholtzzentrum für Schwerionenforschung GmbH | |
Particle therapy is a rapidly growing and potentially the most effective and precise radiotherapy technique. However, only a tiny minority of patients receive protons or heavy ions rather than X-rays these days. Physics research is needed to address a few problems that hamper its wider diffusion. The efforts are toward making particle therapy cheaper, faster, and more conformal.
In this lecture we will give some examples of applications of nuclear physics to particle therapy. In particular, for reducing range uncertainty we will discuss the use of radioactive ion beams (RIBs) for simultaneous treatment and online range verification using positron emission tomography (PET) within the ERC AdG BARB (Biomedical Applications of Radioactive ion Beams) project at GSI/FAIR. We will also report on recent experiments in collaboration with Helmholtz Institute Mainz. Slides here... | |
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Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:00 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Álvaro Pastor Gutiérrez, MPIK Heidelberg | |
While the Standard Model of particle physics has been extremely successful in predicting experimental results, it still leaves us with unanswered questions about dark matter, the imbalance between matter and antimatter, and the emergence of fundamental scales. In this talk, I will outline our initial efforts to explore strong new physics scenarios using the non-perturbative functional renormalisation group. I will begin by introducing the flow equation and applying it to the Standard Model, thereby uncovering previously uncharted high-energy phases in the Higgs potential. The second part of the talk will focus on a comprehensive study of (quasi-)conformal “Technicolour” theories, aiming to identify Higgs-like bound states and detectable dark sectors. To achieve this, we will employ bosonisation techniques, which provide valuable insights into the properties of dynamically emergent bound states. I will conclude with a specific case study addressing the flavour puzzle within the framework of fundamental partial compositeness. | |
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17 Jan 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Stephan Dolan, CERN, Switzerland | |
Accelerator-based neutrino oscillation experiments have the potential to revolutionise our understanding of fundamental physics, offering an opportunity to characterise charge-parity violation in the lepton section, to determine the neutrino mass ordering and to explore the possibility of physics beyond three-flavour neutrino mixing. However, as more data is collected the current and next-generation of experiments will require increasingly precise control over the systematic uncertainties within their analyses. It is well known that some of the most challenging uncertainties to overcome stem from our uncertain modelling of neutrino-nucleus interactions, arising because measured event rates depend on the neutrino interaction cross section in addition to any oscillation probability. The sources of these uncertainties are often related to subtle details of the pertinent nuclear physics, such as the details of the target nucleus ground state, which are extremely difficult to control with sufficient precision. Confronting such uncertainties requires both state-of-art theoretical modelling and precise measurements of neutrino interaction event rates at experiment's near detectors, before oscillations occur. In this talk, we review the role of neutrino interaction systematic uncertainties in current and future measurements of neutrino oscillations as well as the experimental and theoretical prospects for reducing them to an acceptable level for the next generation of experiments. | |
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18 Jan 2024
GRK 2516 Soft Matter Seminar
Uni Mainz 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Sofia Kantorovich, Computational Physics, University of Vienna | |
TBA | |
| at Zoom | |
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Seminar über Theorie der kondensierten Materie / TRR146 Seminar
F. Schmid / G. Settanni / P. Virnau / L. Stelzl 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Sofia Kantorovich, Computational Physics, University of Vienna | |
GRK 2516 Soft Matter Seminar | |
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23 Jan 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| CANCELED: Prof. Jonathan Wurtele, University of Berkeley, California | |
This talk has been canceled due to illness!
The ALPHA Collaboration at CERN synthesizes, traps, and investigates the properties of antihydrogen, the antimatter equivalent of hydrogen. ALPHA’s research has the goal of testing the standard model which holds that antihydrogen and hydrogen have the same spectrum, and the prediction of general relativity that antihydrogen atoms experience the same gravitational force as hydrogen atoms do. ALPHA’s experiments conducted over the last decade produced measurements of the 1S-2S line, hyperfine structure, Lyman-alpha transition, and charge neutrality of antihydrogen. This presentation will predominantly delve into our latest breakthrough. Utilizing an innovative magnet system, we have successfully observed, for the first time, the interaction of neutral antimatter with the Earth’s gravitational field. The best fit to our measurements yields a value of (0.75 ± 0.13 (stat. + syst.) ± 0.16 (simulation)) g for the local acceleration of antimatter towards the Earth, consistent with the predictions of general relativity. We rule out the possibility of antihydrogen experiencing an upwards acceleration g in the Earth’s gravity. Finally, potential paths to higher-precision gravity experiments will be discussed. | |
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Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:00 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Daniel Schmitt, Frankfurt U. | |
Theories beyond the Standard Model (BSM) with classical scale invariance predict an intriguing thermal history of the early Universe. Due to the absence of dimensionful terms at tree level in these models, the electroweak phase transition (EWPT) can be significantly delayed, inducing a period of thermal inflation supercooling the Universe. The exit from this supercooled state can then be triggered via different mechanisms, depending on the model parameter space.
In the first part of my talk, I will discuss the end of supercooling via a strong, first-order QCD chiral phase transition. I will outline how the associated gravitational wave (GW) production can be studied within effective QCD theories, with a particular focus on the effect of thermal inflation on the strongly coupled dynamics.
In the second part, I will present an additional option to realize the exit from supercooling: a tachyonic phase transition. Here, the SM quark condensates source an exponential amplification of BSM scalar fields, generating a unique GW background detectable by future observatories. | |
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24 Jan 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Kai Schmitz, Univ. Münster | |
Pulsar Timing Array (PTA) collaborations around the globe recently announced compelling evidence for low-frequency gravitational waves permeating our entire Universe, that is, a gravitational-wave background (GWB) reaching us from all directions and at all times. This breakthrough achievement has important implications for astrophysics, as the GWB signal, if genuine, is likely to originate from a cosmic population of supermassive black holes orbiting each other at the centers of galaxies. As the referent will illustrate in this talk, the new PTA data is, however, also of great interest to the high-energy physics community, as it allows to probe a broad range of particle physics models of the early Universe that predict the generation of a cosmological GWB in the Big Bang. In this sense, the PTA data opens a new window onto the very early Universe and enables particle physicists to constrain scenarios of new physics beyond the Standard Model at extremely high energies. In his talk, the referent will give an overview of these searches for new physics at the PTA frontier and highlight several cosmological scenarios that underline the relevance of PTA observations for fundamental problems such as dark matter, neutrino masses, and the matter-antimatter asymmetry of the Universe. Finally, he will conclude with a brief outlook on future measurements that may help in discriminating between a GWB signal of astrophysical origin and a GWB signal from the Big Bang. Slides here... | |
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25 Jan 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Dr. Aleksandra Zoilkowska, JGU NEUQUAM Research Group | |
Cold atom experiments offer a distinctive platform for the investigation of many-body quantum physics, especially in non-equilibrium scenarios. The complexity inherent in these experiments often poses challenges to conventional theoretical methods. Nevertheless, exact analytical solutions become feasible when the underlying theory is integrable. Integrability plays a pivotal role in constraining the dynamics of many-body systems, enabling the derivation of, for instance, precise time-dependent density and velocity profiles after inhomogeneous quenches. This unique characteristic establishes a direct correspondence between theoretical predictions and experimental outcomes.
In this talk, I will delve into the essence of quantum integrability and its efficacy in non-equilibrium many-body calculations, utilizing the framework of Generalized Hydrodynamics. An examination of the Lieb-Liniger Hamiltonian will exemplify how integrability has been applied in cold atom setups, resulting in the experimental realization of Quantum Newton's Cradle. Furthermore, I will draw upon my own research to provide insights into other quantum ''beasts'' emerging in out-of-equilibrium physics, rooted in an integrable theory known as the Homogeneous Sine-Gordon Model. | |
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26 Jan 2024
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
F. Schmid / G. Settanni / P. Virnau / L. Stelzl 10:15 Uhr s.t., Lorentz Room, 05-127, Staudingerweg 7 |
| Scott Milner, Penn State University | |
Using simulations to predict miscibility | |
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29 Jan 2024
Seminar about Experimental Particle and Astroparticle Physics (ETAP)
Institut für Physik 12:30 Uhr s.t., Staudingerweg 7, Minkowskiraum |
| Anamika Aggarwal, Institut für Physik | |
Phase-I Upgrade of the ATLAS Level-1 Calorimeter Trigger | |
| at https://indico.him.uni-mainz.de/event/199/ | |
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30 Jan 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Silvia Masciocchi, Heidelberg/GSI | |
Very high energy densities are reached in ultra-relativistic collisions of heavy ions. Under these conditions, the confinement in strongly-interacting matter is lifted, and a quark-gluon plasma (QGP) is formed. At the highest temperatures realized in the laboratory, this system offers us the opportunity to study QCD matter under extreme conditions. The successful heavy-ion program at the LHC provides data of increasing precision. I will illustrate how experimental evidence supports the description of the QGP by fluid dynamics. This has been recently extended to include even rare and penetrating probes such as heavy quarks. Through this description and making use of neural networks and Bayesian inference, we are able to determine fundamental properties of QCD with increasing precision. A quick look into the formidable detectors with which we gain this evidence in the ALICE will complete the overview. Slides here... | |
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Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:00 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Maria Ramos, IFT Madrid | |
Singlet scalars, namely axion-like particles (ALPs), are among the most promising candidates of new physics. Standard (minimal) assumptions in the study of these particles might however hide a large landscape of solutions to different puzzles in the Standard Model, which can limit our discovery potential. In the first part of the talk, I will consider the impact of scalar mixing in the standard axion mechanism to solve the strong CP problem. I will show that the canonical axion mass-scale relation can be modified within QCD and multiple signals may be required to reconstruct the full solution to the strong CP problem, constrained by a precise sum rule. In the second part of the talk, I will discuss the impact of operator mixing, via RGEs, in the ALP parameter space. I will specially focus on shift-breaking and CP violating effects, and I will discuss some phenomenological applications. | |
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31 Jan 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., MITP seminar room, Staudingerweg 9, 02-430 |
| Noah Fleischer, LUB Mannheim | |
Mixed teams have greater collective knowledge, better ideas and fewer sick days. In short: more success. However, diverse teams also have different perspectives and are therefore more complex to manage. Professors often reach their limits with traditional management styles. This is because stereotypes relating to gender, age and social background persist and hinder equality.
This leadership workshops deals with facts and figures on the topic of diversity & leadership in the university landscape - Anchoring diversity measures in daily university processes - Strategic leadership and teaching behavior using linguistic reframing techniques - Development of individually tailored measures for everyday life.
Noah Fleischer combines his many years of experience in international management consulting in the corporate, political, and academic sectors with expertise as a university lecturer in advanced analytics and AI application development. He also advocates for the integration of diversity into the sustainability strategy and EU taxonomy. Noah Fleischer is also active as a mentor in the Friedrich Ebert Foundation and UN speaker on the topic of gender lens investing.
All professors and group leaders are welcome. Please note that registration is required at prisma@uni-mainz.de until January, 10. | |
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01 Feb 2024
GRK 2516 Soft Matter Seminar
Uni Mainz 17:00 Uhr s.t., TU Darmstad (Room, TBA) |
| Günter Auernhammer, Leibniz Institute for Polymer Research, Dresden | |
TBA | |
| at Zoom | |
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Seminar über Theorie der kondensierten Materie / TRR146 Seminar
F. Schmid / G. Settanni / P. Virnau / L. Stelzl 14:30 Uhr s.t., Minkowski Room, 05-119, Staudingerweg 7 |
| Günter Auernhammer, Leibniz Institute for Polymer Research, Dresden | |
GRK 2516 Soft Matter Seminar | |
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Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Piet van Duppen, KU Leuven, Belgien | |
The thorium-229 nucleus contains an isomeric state with a low excitation energy, making it possible to probe using lasers. It is one of the best candidates for the development of a nuclear clock [1,2] which will enable the ability to test fundamental principles in physics (see e.g. [4]). However, to accomplish such a nuclear clock, the nuclear properties of the isomer need to be determined more precisely and two approaches are being followed.
VUV spectroscopy revealed the radiative decay of the thorium-229 isomer in a study at ISOLDE-CERN by populating the isomer via the beta decay of actinium-229, implanting the beam in large bandgap crystals (CaF2 and MgF2). A reduced uncertainty of the isomer’s excitation energy (8.338±0.024 eV) and a first determination of the half-life (670±102 s) in MgF2 was reported [5]. During a follow-up campaign, different crystals were tested, the energy was determined with a better precision and the half-life behaviour of the VUV signal in the different crystals was studied.
Preparatory work to perform laser ionization spectroscopy of the thorium-229 ground and isomeric states, populated in the alpha decay of uranium-233, is performed in an argon gas-jet based system. These studies, aimed to deduce the mean-square charge radii and moments of both ground and isomeric state, are based on singly charged thorium ions and necessitates a search for efficient and effective laser ionization schemes of thorium giving rise to a more precise determination of the first and second ionization potential. Results from these off and on-line studies will be presented and outlook to future work discussed.
[1] E. Peik and C. Tamm, EPL 61, 181 (2003).
[2] C. Campbell et al., Phys. Rev. Lett. 108, 120802 (2012).
[3] L. von der Wense et al. Nature 533 (7601), 47–51 (2016).
[4] E. Peik et al., Quantum Sci. Technol. 6, 034002 (2021).
[5] Kraemer et al., Nature 617, 706–710 (2023). | |
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Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 14:00 Uhr s.t., 01 122 Newton-Raum |
| Huaiyang YUAN, TU Delft and Zhejiang University | |
There is a rising interest in integrating magnetic systems with known quantum platforms for multi-functional quantum information processing. The coupling among magnons, photons, phonons, and qubits has already been proposed and demonstrated in the experiments. In this talk, I will introduce our recent results on the interplay of magnons and surface plasmons in two-dimensional systems. Our findings may open a novel route to integrate plasmonic and spintronic devices and bridge the fields of low-dimensional physics, plasmonics, and spintronics. | |
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06 Feb 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. J.C. Seamus Davis, University of Oxford | |
Everything around us, everything each of us has ever experienced, and virtually everything underpinning our technological society and economy is governed by quantum mechanics. Yet this most fundamental physical theory of nature often feels as if it is a set of somewhat eerie and counterintuitive ideas of no direct relevance to our lives. Why is this? One reason is that we cannot perceive the strangeness (and astonishing beauty) of the quantum mechanical phenomena all around us by using our own senses.
I will describe the history of development of techniques that allow us to visualize electronic quantum phenomena and new states of quantum matter directly at the atomic scale. As recent examples, we will visually explore the previously unseen and very beautiful forms of quantum matter making up electronic liquid crystals[1,2], high temperature superconductors[2,3,4] and electron-pair crystals[5,6,7,8]. I will discuss the implications for fundamental physics research and also for advanced materials and new technologies, arising from quantum matter visualization.
References:
1. Science 344, 612 (2014)
2. Nature 570, 484 (2019)
3. Science 357, 75 (2017)
4. Science 364, 976 (2019)
5. Nature 571, 234 (2020)
6. Nature 532, 343 (2016)
7. Science 372, 1447 (2021)
8. Nature 618, 921 (2023) Slides here... | |
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Seminar Festkörper- und Grenzflächenphysik KOMET - experimentell
Institut für Physik 12:00 Uhr s.t., Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebäude) |
| TBA, TBA | |
TBA | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Filippo Sala, U. Bologna | |
I will show how first order phase transitions (PT) in the early universe, with relativistic bubble walls, constitute particle accelerators and colliders via the dense shell of particles that they necessarily accumulate. These `bubbletrons' offer novel opportunities of observational access to very high energy scales, in addition to the gravitational waves from the PT. As three examples, I will discuss: i) non-adiabatic production of ZeV dark matter which is hot enough to leave an imprint in the matter power spectrum; ii) production of relics beyond the GUT scale without the need for the universe to ever reach those temperatures; iii) realization of testable baryogenesis and leptogenesis down to the TeV scale. In passing I will mention open questions about the physics of particle shells at bubble walls, and their potential far-reaching implications. | |
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07 Feb 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Martin Fertl, JGU Mainz, Institut für Physik, QUANTUM | |
Please see attachment Slides here... | |
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08 Feb 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. J.C. Séamus Davis, University of Oxford, Oxford, UK | |
Although UTe2 appears to be the first 3D spin-triplet topological superconductor, its superconductive order-parameter Δ_k has not yet been established. If spin-triplet, it should have odd parity so that Δ_(-k)=-Δ_k and, in addition, may break time-reversal symmetry. A distinctive identifier of 3D spin-triplet topological superconductors is the appearance of an Andreev bound state (ABS) on all surfaces parallel to a nodal axis, due to the presence of a topological surface band (TSB). Moreover, theory shows that specific ABS characteristics observable in tunneling to an s-wave superconductor distinguish between chiral and non-chiral Δ_k. To search for such phenomena in UTe2 we employ s-wave superconductive scan-tip imaging of UTe2 [1] to discover a powerful zero-energy ABS signature at the (0-11) crystal termination [2]. Its imaging yields quasiparticle scattering interference signatures of two Δ_k nodes aligned with the crystal a-axis. Most critically, development of the zero-energy Andreev conductance peak into two finite-energy particle-hole symmetric conductance maxima as the tunnel barrier is reduced, signifies that UTe2 superconductivity is non-chiral. Overall, the discovery of a TSB, of its a zero-energy ABS, of internodal scattering along the a-axis, and of splitting the zero-energy Andreev conductance maximum due to s-wave proximity, categorizes the superconductive Δ_k as the odd-parity non-chiral B3u state [2], which is equivalent to the planar state of superfluid 3He.
[1] Nature 618, 921 (2023)
[3] Gu, Wang, et al. Science (2023) | |
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07 Mar 2024
Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)
JGU 14:00 Uhr s.t., 01 122 Newton-Raum |
| Prof. Russell Cowburn, University of Cambridge Cambridge United Kingdom | |
An amazing range of new magnetic nanomaterials have been developed by the semiconductor and data storage industry as part of their adoption of spintronic technologies. Most of these materials are focused on the storage, retrieval and processing of digital data, e.g. hard disk drives in the Cloud or new designs of low energy microprocessors. But could these same materials be used for other things, outside of the world of digital data? In this talk I describe how we have re-tasked advanced magnetic nanomaterials for problems in biomedicine. In particular, I show a novel form of cancer therapy based on mechanical disruption of cellular structure using spinning magnetic nanostructures, our work towards early stage detection of kidney cancer using magnetic nanostructures and work on live adherent cells riding on the backs of nanostructured magnetic carriers for drug discovery. | |
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20 Mar 2024
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Tom Tong, Siegen U. | |
The SMEFT global analyses commonly encounter two significant challenges:
1. An incomplete set of observables.
2. Ad-hoc flavor assumptions.
These issues significantly undermine the reliability and applicability of the results.
In our recent work, we merged LHC data with EWPO and revealed that global fits to this data set exhibit striking discrepancies with low-energy data. Our findings underscore the necessity of including low-energy observables, such as neutron and nuclear beta decay, along with meson decays, in SMEFT global fits.
By integrating insights from collider processes (C), low-energy processes (L), and electroweak precision observables (EW), we introduce a holistic CLEW approach, and as a case study, we shed light on potential BSM sources of the Cabibbo Angle Anomaly (CAA), which demonstrates roughly a 3-sigma deviation. We were able to apply strong phenomenological constraints instead of relying on flavor assumptions to reduce the number of operators involved, facilitating a nearly flavor-assumption-independent global analysis.
Moreover, to aid in model building and guide experimental searches, we utilized the Akaike Information Criterion (AIC) to identify the most relevant operators. The AIC helps select a group of operators that not only fit well with the experimental data but also avoid unnecessary complexity.
Additionally, I aim to further discuss the importance of including low-energy neutral current data. The remarkable precision of the P2 experiment at MESA will be competitive with existing collider measurements. We are currently upgrading our CLEW framework to fully incorporate low-energy parity violation, including the future projection of P2. | |
Special Seminar with KPH |
16 Apr 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Ulrich Stroth, Max Planck Institute for Plasma Physics, Garching | |
In times of a shift towards a low CO2 energy supply and boosted by the recent success of laser fusion, the advantages of nuclear fusion in general have come into the focus of politics and private investors as an attractive energy source. This talk introduces the concept of magnetic fusion and outlines the path to a fusion reactor. The perspectives of magnetic fusion will be compared with those of laser fusion and the concepts of startups. The role of plasmas, in which energy is obtained from the fusion of hydrogen isotopes, and their physical properties are explained. Slides here... | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Julio Virrueta, Jena U. | |
I will discuss the real-time dynamics of metric perturbations around the AdS black hole and argue that the dynamic of these modes is captured by a set of designer scalars in the background geometry. Using these results I will obtain the real-time Gaussian effective action, which includes both the retarded response and the associated stochastic fluctuations. Finally, I will discuss extensions beyond linear response. | |
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17 Apr 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Koichi Hamaguchi, Univ./IPMU Tokyo, Japan | |
Supernova-Scope for the Direct Search of Supernova Axions | |
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aktuell
18 Apr 2024
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
F. Schmid / G. Settanni / P. Virnau / L. Stelzl 14:30 Uhr s.t., Minkowski-Raum, 05-119, Staudingerweg 7 |
| Felix Höfling, Freie Universität Berlin | |
Emergent phenomena in flowing matter | |
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Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Dr. Felix Tennie, Imperial College, London, UK | |
Nonlinear differential equations are ubiquitous in Physics, Engineering, Chemistry, Materials Science, and various other subjects. Numerical integration often requires resources exceeding current classical supercomputers. Quantum computing presents a fundamentally different computing paradigm. Quantum algorithms have a proven scaling advantage in many linear tasks such as Fourier transformation, matrix inversion, SVD, to name but a few. Yet, due to the linear evolution of quantum systems, integrating nonlinear dynamics on quantum computers is hard. In this talk I will present different approaches for integrating nonlinear differential equations on quantum computers, and will discuss their suitability for different types of quantum hardware. | |
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zukünftige Termine
23 Apr 2024
Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Yann Gouttenoire, Tel Aviv U. | |
Cosmological first-order phase transitions are said to be strongly supercooled when the nucleation temperature is much smaller than the critical temperature. The phase transition takes place slowly and the probability distribution of bubble nucleation times is maximally spread. Hubble patches which get percolated later than the average are hotter than the background after reheating and potentially collapse into primordial black holes (PBHs). I will give a review of this PBHs formation mechanism and of its most recent developments. | |
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24 Apr 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Bastian Märkisch, TU München | |
Neutron Beta Decay with Perkeo III and Perc | |
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25 Apr 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14 Uhr c.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Ralf Röhlsberger, DESY, Hamburg | |
Using the high-intensity radiation of the European X-ray Free-Electron Laser, we recently succeeded to excite the sharpest atomic transition in the hard X-ray range, the 12.4 keV nuclear resonance of the stable isotope Scandium-45 [1].
With its extremely narrow natural linewidth of 1.4 femto-eV, it opens not only new possibilities for the development of a nuclear clock, but also for research linked to the foundations of physics, such as time variations of the fundamental constants, the search for dark matter as well as probing the foundations of relativity theory.
Furthermore, our experiment demonstrates the great potential of self-seeding X-ray lasers with high pulse rates as a promising platform for the spectroscopy of extremely narrow-band nuclear resonances.
The next steps towards a nuclear clock based on Scandium-45 require a further increase of the spectral photon flux using improved X-ray laser sources at 12.4 keV and the development of frequency combs reaching up to this energy.
[1] Yuri Shvyd’ko et al., Nature 622, 471 (2023) | |
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30 Apr 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Joacim Rocklöv, Heidelberg University | |
In this talk I will introduce infectious diseases and their sensitivity to climate variability and change. I will describe and contrast experimental evidence with empirical observations and data. In the talk I will discuss systems and interactions enabling introduction and transmission of emergent vectors, hosts, and pathogens. I will further give examples of how mathematical process-based models and machine learning approaches are used and how they can be applied to study patterns and responses to these changes. Finally, I will talk about novel applications of machine learning in surveillance and early warnings, as well as the evaluation of interventions to guide effective responses. Slides here... | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Marco Fedele, IFIC, Valencia | |
TBA | |
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02 May 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dr. Matthias Christandl, University of Copenhagen, Denmark | |
In these days, we are witnessing amazing progress in both the variety and quality of platforms for quantum computation and quantum communication. Since algorithms and communication protocols designed for traditional 'classical' hardware do not employ the superposition principle and thus provide no gain even when used on quantum hardware, we are in need of developing specific quantum algorithms and quantum communication protocols that make clever use of the superposition principle and extract a quantum advantage. "Quantum hardware needs quantum software", so to say. Furthermore, due to noise in the qubits, known as decoherence, an additional quantum-specific software layer is required that emulates a perfect quantum machine on top of a noise one. I will demonstrate our recent work on this subject with theorems as well data from university and commercial quantum devices. | |
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07 May 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Michael Kramer, Max Planck Institute for Radio Astronomy, Bonn | |
Pulsars, the natural beacons of the universe, put physics to extreme test. As neutron stars, they are not only the densest objects in the observable universe, but they also serve as high-precision laboratories for testing the general theory of relativity. Pulsars not only allow the observation of predicted effects that cannot be observed by other methods, but they provide also extremely precise tests of the properties of gravitational waves. The latest results even use pulsars as galactic gravitational wave detectors, which detect a continuous "hum" of space-time. This buzz is, most likely, caused by the merging of supermassive black holes in the early universe. The talk gives an overview of the latest results and an outlook into the future. Slides here... | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Antonela Matijašić, MPP, Munich | |
TBA | |
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08 May 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Gregor Kasieczka, Universität Hamburg | |
Latest Developments in Machine Learning | |
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14 May 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Jochem Marotzke, Max Planck Institute for Meteorology, Hamburg | |
The cause and the future of climate change | |
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15 May 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. John Bulava, Universität Bochum | |
Novel Methods in Lattice Spectroscopy | |
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16 May 2024
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
F. Schmid / G. Settanni / P. Virnau / L. Stelzl 14:30 Uhr s.t., Minkowski-Raum, 05-119, Staudingerweg 7 |
| Sonya Hansen, Flatiron Institute | |
TBA | |
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21 May 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Cristian Micheletti, SISSA, Trieste, Italy | |
Sampling equilibrium ensembles of dense polymer mixtures is a paradigmatically hard problem in computational physics, even in lattice-based models. For instance, using real-space Monte Carlo to sample polymer systems becomes impractical for increasing size, rigidity, and density of the chains. In response to these challenges, we introduce and apply a formalism to recast polymer sampling as a quadratic unconstrained binary optimization (QUBO) problem [1].
Thanks to this mapping, dense systems of stiff polymers on a lattice can be efficiently sampled with classical QUBO solvers, resulting in more favourable performance scaling compared to real-space Monte Carlo [2]. Tackling the same problems with the D-Wave quantum annealer leads to further performance improvements [2]. As an application, we discuss the use of the quantum-inspired encoding on a hitherto untackled problem, namely the linking probability of equilibrated melts of ring polymers, for which we unveil counterintuitive topological effects.
References
[1] C.Micheletti, P. Hauke and P. Faccioli, "Polymer physics by quantum computing", Phys. Rev. Lett. 127, 080501 (2021)
[2] F. Slongo, P. Hauke, P. Faccioli and C. Micheletti "Quantum-inspired encoding enhances stochastic sampling of soft matter systems", Sci. Adv. 9, art. no adi0204 (2023) Slides here... | |
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22 May 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Prateek Agrawal, Oxford, UK | |
Beyond the Standard Model through the Axion Lens | |
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23 May 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Dr. Hans Keßler, Universität Hamburg | |
In driven non-linear systems, various kinds of bifurcations can be observed on their route to chaos. From the evolution of Floquet multipliers one can extract information which serves as a precursor for phase transitions and dynamical instabilities. This method is applied in classical non-linear physics, for example, to obtain early warning signals.
Utilising our impressive control over an atom-cavity platform, we are able to prepare our system in various dynamical regimes and study the bifurcation experimentally in a quantum gas to obtain insights that could potentially be applied to more complex systems.
We prepare a Bose-Einstein condensate inside the centre of a cavity and pumping it perpendicular to the cavity axis with a standing wave light field. Upon crossing a critical pump strength, we observe a pitchfork phase transition from a normal to a steady state self-organized phase [1]. Employing an open three- level Dicke model, this transition can be understood as a transition between two fixpoints, indicating a pitchfork bifurcation. If the pump strength is increased further, the system undergoes a Hopf bifurcation. This causes limit cycles, which have time crystalline properties, to emerge [2]. In this regime, our model no longer shows fixpoints but stable attractive periodic orbits [3]. For strong pumping, we observe a second bifurcation, in our case a Neimark-Sacker bifurcation. Its main characteristics is an oscillation with two incommensurate frequencies, this may indicate the formation of a continuous time quasicrystal [4]. Finally, in the regime of very strong pumping, we observe chaotic dynamics with many contributing frequencies.
References:
[1] J. Klinder, et al., PNAS 112, 11 (2015)
[2] P. Kongkhambut, et al., Science 307 (2022)
[3] J. Skulte, et al., arXiv:2401.05332 (2023)
[4] P. Kongkhambut, et al., manuscript in preparation | |
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28 May 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Ingo Rehberg, University of Bayreuth | |
tba | |
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29 May 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Kathrin Valerius, KIT | |
Weighing the Neutrino with KATRIN - Latest Results and Future Prospects | |
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04 Jun 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Claudia Felser, Max Planck Institute for Chemical Physics of Solids, Dresden | |
Topology, a well-established concept in mathematics, has nowadays become essential to describe condensed matter. At its core are chiral electron states on the bulk, surfaces and edges of the condensed matter systems, in which spin and momentum of the electrons are locked parallel or anti-parallel to each other. Magnetic and non-magnetic Weyl semimetals, for example, exhibit chiral bulk states that have enabled the realization of predictions from high energy and astrophysics involving the chiral quantum number, such as the chiral anomaly, the mixed axial-gravitational anomaly and axions. The potential for connecting chirality as a quantum number to other chiral phenomena across different areas of science, including the asymmetry of matter and antimatter and the homochirality of life, brings topological materials to the fore. Slides here... | |
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05 Jun 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Jacobo López-Pavón, Universidad de Valencia, Spain | |
Recent Developments in Heavy Neutral Leptons | |
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06 Jun 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Nicolò Defenu, ETH Zürich | |
The concept of universality has shaped our understanding of many-body physics, but is mostly limited to homogenous systems. The seminar introduces a definition of universal scaling on a non-homogeneous graph. The corresponding scaling theory is expected to depend only on a single parameter, the spectral dimension ds, which plays the role of the relevant parameter on complex geometries. We will then focus on a concrete example, the long-range diluted graph (LRDG), which allows to tune the value of the spectral dimension continuously. By means of extensive numerical simulations, we probe the scaling exponents of a simple instance of O(N) symmetric models on the LRDG showing quantitative agreement with the theoretical prediction of universal scaling in fractional dimensions. | |
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11 Jun 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Dr. Karen Alim, TU München | |
Propagating, storing and processing information is key to take smart decisions – for organisms as well as for autonomous devices. In search for the minimal units that allow for complex behaviour, the slime mould Physarum polycephalum stands out by solving complex optimization problems despite its simple make-up. Physarum’s body is an interlaced network of fluid-filled tubes lacking any nervous system, in fact being a single gigantic cell. Yet, Physarum finds the shortest path through a maze. We unravel that Physarum’s complex behaviour emerges from the physics of active flows shuffling through its tubular networks. Flows transport information, information that is stored in the architecture of the network. Thus, tubular adaptation drives processing of information into complex behaviour. Taking inspiration from the mechanisms in Physarum we outline how to embed complex behaviour in active microfluidic devices and how to program human vasculature. Slides here... | |
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12 Jun 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Jessica Turner, Durham University, UK | |
Primordial Black Holes and Leptogenesis | |
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13 Jun 2024
Seminar über Theorie der kondensierten Materie / TRR146 Seminar
F. Schmid / G. Settanni / P. Virnau / L. Stelzl 14:30 Uhr s.t., Minkowski-Raum, 05-119, Staudingerweg 7 |
| Dr. Narendra Kumar, BionTech | |
Industry Talk on BionTech | |
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Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Eugene Polzik, University of Copenhagen, Denmark | |
TBA | |
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18 Jun 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Dr. Thomas Cocolios, KU Leuven, Belgium | |
Nuclear medicine is currently experiencing some major changes and developments: Lu-177 has become a standard radionuclide for patient care, in particular with Lutathera® and Pluvito®, two recently marketed drug for endocrine and prostate cancers, respectively. Those successes are but the tip of the iceberg of possibilities: with 3000 radionuclides synthesized in the laboratory, it seems unbelievable that only a handful are actually used in medical applications. This is mostly due to the absence of a supply pipeline to support research until their production is picked up by the industry. To break that paradigm, CERN has established the MEDICIS facility (MEDical Isotopes Collected from ISolde), where the techniques developed for the last 50 years on radioactive ion beams are now applied to produce medical radionuclides for research. The success of the development of non-carrier-added Sm-153 has led it to first clinical trials in 2024. At the European level, this has triggered a new consortium, federated around MEDICIS but with a larger reach, as PRISMAP, the European medical radionuclide programme. Slides here... | |
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19 Jun 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Joel Swallow, CERN, Switzerland | |
New Results From the NA62 Experiment | |
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20 Jun 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Dr. Janis Nötzel, TUM, München | |
TBA | |
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25 Jun 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Klaus Blaum, Max-Planck Institute for Nuclear Physics | |
tba | |
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26 Jun 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Dr. Alessandro Lovato, Argonne National Lab, USA | |
Uncertainty Quantification in Nuclear Physics | |
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27 Jun 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Oded Zilberberg, Universität Konstanz | |
Topological classification of matter has become crucial for understanding (meta-)materials, with associated quantized bulk responses and robust topological boundary effects [1]. Topological phenomena have also recently garnered significant interest in nonlinear systems [2]. In particular, weak nonlinearities can result in parametric gain, leading to “non-Hermitian” metamaterials and the associated topological classification of open systems [3]. Here, we venture into this expanding frontier using an approach that moves away from quasilinear approximations around the closed system classification. We harness instead the topology of structural stability of vector flows, and thus propose a new topological graph invariant to characterize nonlinear out-of-equilibrium dynamical systems via their equations of motion. We exemplify our approach on the ubiquitous model of a dissipative bosonic Kerr cavity, subject both to one- and two-photon drives. Using our classification, we can identify the topological origin of phase transitions in the system, as well as explain the robustness of a multicritical point in the phase diagram. We, furthermore, identify that the invariant distinguishes population inversion transitions in the system in similitude to a Z2 index. Our approach is readily extendable to coupled nonlinear cavities by considering a tensorial graph index.
References
[1] T. Ozawa, H. M. Price, A. Amo, N. Goldman, M. Hafezi, L. Lu, M. Rechtsman, D. Schuster, J. Simon, O. Zilberberg, and I. Carusotto, Rev. Mod. Phys. 91, 015006 (2019).
[2] A. Szameit, and M. C. Rechtsman, Nat. Phys. (2024).
[3] K. Ding, C. Fang, and G. Ma, Nat. Rev. Phys. 4, 745 (2022). | |
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02 Jul 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Laura Kreidberg, Max Planck Institute for Astronomy, Heidelberg | |
The recent launch of the James Webb Space Telescope (JWST) has revolutionized the field of exoplanet atmosphere characterization, thanks to its unprecedented sensitivity and broad wavelength coverage. In this talk, I will give a tour of the latest JWST results for transiting exoplanets, from gas giants down to rocky worlds. For the largest planets, I'll focus on the complex physical processes recently revealed in their atmospheres, including photochemistry, 3D effects, and cloud formation. Pushing down to smaller worlds, I'll share the first measurements of chemical composition for the elusive sub-Neptune population; and finally give an update on which (if any) rocky planets have atmospheres at all. Slides here... | |
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Theorie-Palaver
Institut für Physik 14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor) |
| Jorinde van de Vis, Leiden U. | |
TBA | |
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03 Jul 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| PD Dr. Teresa Marrodan, MPI Heidelberg | |
Update on XENON Analyses and Outlook on DARWIN/XLZD | |
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09 Jul 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Dr. Kerem Çamsarı, University of California, Santa Barbara | |
tba | |
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10 Jul 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Louis Strigari, Texas University, USA | |
Astrophysical and Terrestrial Applications of Coherent Neutrino Scattering | |
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11 Jul 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Nir Bar-Gill, Hebrew University, Jerusalem | |
The study of open quantum systems, quantum thermodynamics and quantum many-body spin physics in realistic solid-state platforms, has been a long-standing goal in quantum and condensed-matter physics. In this talk I will address these topics through the platform of nitrogen-vacancy (NV) spins in diamond, in the context of bath characterization, purification (or cooling) of a spin bath as a quantum resource and for enhanced metrology and sensing.
I will first describe our work on characterizing noise using robust techniques for quantum control ([1], in collaboration with Ra’am Uzdin). This approach suppresses sensitivity to coherent errors while enabling noise characterization, providing a useful tool for the study of complicated open quantum systems, with the potential for contributions to enhanced sensing. I will then present a general theoretical framework we developed for Hamiltonian engineering in an interacting spin system [2]. This framework is applied to the coupling of the spin ensemble to a spin bath, including both coherent and dissipative dynamics [3]. Using these tools I will present a scheme for efficient purification of the spin bath, surpassing the current state-of-the-art and providing a path toward applications in quantum technologies, such as enhanced MRI sensing.
Finally, if time permits, I will describe our work in using NV-based magnetic microscopy to implement quantum sensing in various modalities. I will present advanced techniques for improving sensing bandwidth using compressed sensing and machine learning. Demonstrations of NV sensing capabilities will include measurements of 2D vdW magnetic materials, and specifically the phase transition of FGT through local imaging of magnetic domains in flakes of varying thicknesses [4], as well as a technique for sensing radical concentrations through the change in the charge state of shallow NVs ([5], in collaboration
with Uri Banin).
1. P. PENSHIN ET. AL., SUBMITTED.
2. K. I. O. BEN’ATTAR, D. FARFURNIK AND N. BAR-GILL, PHYS. REV. RESEARCH 2, 013061 (2020).
3. K. I. O. BEN’ATTAR ET. AL., IN PREPARATION.
4. G. HAIM ET. AL., IN PREPARATION.
5. Y. NINIO ET. AL., ACS PHOTONICS 8, 7, 1917-1921 (2021). | |
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16 Jul 2024
Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Dr. Frank Saueressig, Radboud University, NL | |
Fusing the principles of general relativity and quantum mechanics in a consistent theoretical framework still constitutes one of the main open challenges in theoretical physics today. Over the last decades, the gravitational asymptotic safety program has taken significant steps towards achieving this goal. A central virtue, driving the success of the approach, is its conservative nature: the program builds on well-established principles of quantum field theory and extends them in a rather minimalistic way. In this talk, we will review the key developments in the program, building up to its present status. I will also attempt to give an outlook on the challenges that need to still be addressed in the future. Slides here... | |
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Physikalisches Kolloquium
Institut für Physik 16:15 Uhr s.t., HS KPH |
| Prof. Dr. Reinhard Noack, Philipps University Marburg | |
Colloquium in honor of Prof. Dr. Peter G. J. van Dongen and Prof. Dr. Martin Reuter (Part 2): Correlated Electrons from Zero to Infinite Dimensions: Early Days of KOMET in Mainz | |
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17 Jul 2024
PRISMA+ Colloquium
Institut für Physik 13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7 |
| Prof. Dr. Stefan Schoenert, TU Munich | |
LEGEND and the Quest for Majorana Neutrinos | |
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18 Jul 2024
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik 14:00 Uhr s.t., IPH Lorentzraum 05-127 |
| Prof. Dominik Bucher, TUM, München | |
The nitrogen-vacancy (NV) point defect in diamond has emerged as a new class of quantum sensor, enabling the detection of magnetic fields on unprecedented length scales. This technique allows the measurement of magnetic resonance signals on the nanoscale down to a single electronic or nuclear spin. In my talk, I will briefly introduce the fundamentals of diamond-based quantum sensing. In the second part, I will discuss recent developments in my group to use the optical readout of the NV centres to perform magnetic resonance microscopy in real space inside microfluidic structures. The remaining obstacles to this novel microscopy technique and future goals are discussed in the final part. | |
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