Semesterübersicht

Semesterübersicht Sommersemester 2021

Wintersemester 2020/2021 - Sommersemester 2021 - Wintersemester 2021/2022

07 Apr 2021

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t.

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.

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.

Thomas Speck, Johannes Gutenberg University
TBA
at Zoom

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t.

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.

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.

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.

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.

Angelika Kühnle, Bielefeld University
TBA
at Zoom

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t.

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.

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.

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.

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.

Javier Fuentes, JGU
Flavor anomalies in B decays
at Zoom

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

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.

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.

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.

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.

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.

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.

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

aktuell

11 May 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

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 Zoom

Theorie-Palaver

Institut für Physik

14:30 Uhr s.t.

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

zukünftige Termine
12 May 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Michael Kappl, MPI-Polymer Research
Supraparticles from superomniphobic surfaces
at Zoom

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t.

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.

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.

Kathrin Valerius, Karlsruher Institute of Technology, Germany
News on the Neutrino-Mass Measurement
at Zoom

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.

Iwona Grabowska-Bold, Krakow
Heavy Ion Physics at the LHC
at Zoom

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

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.

Karin Everschor-Sitte, JGU
tba
at Zoom and SPICE YouTube Channel

20 May 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

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.

Gilad Perez, Weizmann Institute
Beyond standard model theory in AMO
at Zoom

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Kurt Kremer, MPI-Polymer Research
TBA
at Zoom

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t.

James G. Analytis, Berkeley
tba
at Zoom and SPICE YouTube Channel

27 May 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

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

01 Jun 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Katia Parodi, University of Munich, Germany
High Precision Ion Therapy
at Zoom

02 Jun 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Nathalie Katsonis, University of Groningen, The Netherlands
TBA
at Zoom

03 Jun 2021

Theoriekolloquium

Die Dozierenden der Theoretischen Physik

16:00 Uhr s.t., Newton-Raum, Staudinger Weg 9, 01-122

Javier Argüello Luengo, ICFO
TBA Topic: Th. Kolloquium Time: Jun 3, 2021 04:00 PM Amsterdam, Berlin, Rome, Stockholm, Vienna Join Zoom Meeting https://zoom.us/j/95333368894?pwd=bitvZWVmSE15MGNydmFKbitxSE5qQT09 Meeting ID: 953 3336 8894 Passcode: 090910
at Zoom

08 Jun 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

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

09 Jun 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Regine von Klitzing, Technical University of Darmstadt
TBA
at Zoom

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t.

Sangeeta Sharma, Max-Born-Institute
Ultrafast coupled charge, spin and nuclear dynamics: ab-initio description
at Zoom and SPICE YouTube Channel

10 Jun 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

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

15 Jun 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Helmut Satz, University of Bielefeld, Germany
The Statistical Mechanics of Bird Swarms
at Zoom

Theorie-Palaver

Institut für Physik

14:30 Uhr s.t., MITP seminar room

Matthew Reece, Harvard U.
TBA
at Zoom

16 Jun 2021

PRISMA Colloquium

Institut für Physik

13:00 Uhr s.t.

Matteo Cadeddu, INFN Cagliari
Coherent elastic neutrino scattering and constraints for the neutron skin
at Zoom

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Sigi Waldvogel, Johannes Gutenberg University
TBA
at Zoom

17 Jun 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

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

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

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.

Felix Tuczek, Christian-Albrechts-Universität zu Kiel
Spin-state switching of iron complexes adsorbed on surfaces
at Zoom

22 Jun 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Horst Geckeis, Karlsruher Institute of Technology, Germany
Endlagerstätten in Deutschland
at Zoom

23 Jun 2021

PRISMA Colloquium

Institut für Physik

17:00 Uhr s.t.

Svetlana Barkanova, Memorial University
please note different time!
at Zoom

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Hans-Jürgen Butt, MPI-Polymer Research
TBA
at Zoom

24 Jun 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

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

28 Jun 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

29 Jun 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

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 Zoom

30 Jun 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Jens-Uwe Sommers, Leibniz Institute of Polymer Research, Dresden
TBA
at Zoom

01 Jul 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

Dr. Sven Herrmann, ZARM, Universität Bremen
TBA
at Zoom

06 Jul 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Ken Carslaw, University of Leeds, Great Britain
Ice nucleation and its effect on the sensitivity of Earth´s climate
at Zoom

07 Jul 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Sebastian Seiffert, Johannes Gutenberg University
TBA
at Zoom

08 Jul 2021

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14:00 Uhr s.t.

Prof. Dr. Hiroshi Kawarada, School of Fundamental Science and Engineering, Waseda University, Japan
TBA
at Zoom

13 Jul 2021

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

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

14 Jul 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t.

Friederike Schmid, Johannes Gutenberg University
TBA
at Zoom

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.

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