Semesterübersicht Sommersemester 2020

Wintersemester 2019/2020 - Sommersemester 2020 - Wintersemester 2020/2021

02 Apr 2020

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., Newtonraum, 01-122, Staudingerweg 9

Bing Li, Postdoctoral researcher, Institute of physics, JGU Mainz
Shaping membrane vesicles by adsorption of a semiflexible polymer

17 Apr 2020

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

10:30 Uhr s.t., online lecture series - streaming link: https://conference.uni-mainz.de/meet/dion/JBQR5429

Merlin Pohlit, Uppsala University, Department of Physics and Astronomy
Mesoscopic Spin Systems & Local Magnetic Sensing

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

15:00 Uhr s.t., online lecture series - streaming link: https://conference.uni-mainz.de/meet/dion/8VBKC6N9

Simon Moser, Uni Würzburg
ARPES on complex materials: A story told by electrons

21 Apr 2020

Theorie-Palaver

Institut für Physik

14:30 Uhr s.t.

Michele Redi, Florence U. and INFN
I will describe the conditions under which the Peccei-Quinn phase transition of the QCD axion is first order. I will then show that in approximately conformal scenarios, both at weak and strong coupling, the PQ phase transition can lead to a gravity wave background that is within the reach of Ligo or future ground based experiments.
at Zoom

22 Apr 2020

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

10:30 Uhr s.t.

Nadejda Bouldi, Heidelberg University
Core level spectroscopies to study magnetic materials
at Skype for Business

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

15:00 Uhr s.t.

Angela Wittmann, Massachusetts Institute of Technology
Spintronic phenomena at interfaces
at Skype for Business

23 Apr 2020

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

Institut für Physik

14:00 Uhr s.t.

Dr. Tobias Jenke, ILL Grenoble
Neutrons are excellent probes to test gravity at short distances – electrically neutral and only hardly polarizable. Very slow, so-called ultracold neutrons form bound quantum states in the gravity potential of the Earth. This allows combining gravity experiments at short distances with powerful resonance spectroscopy techniques, as well as tests of the interplay between gravity and quantum mechanics. In the last decade, the qBounce collaboration has been performing several measurement campaigns at the ultracold and very cold neutron facility PF2 at the Institut Laue-Langevin in Grenoble/France. A new spectroscopy technique, Gravity Resonance Spectroscopy, was developed and realized, and snapshots of falling wavepackets of these gravitationally bound quantum states were recorded. The results were applied to test gravity at micron distances as well as various Dark Energy and Dark Matter scenarios in the lab, like Axions, Chameleons and Symmetrons. In my talk, I will review the experiments, explain key technologies and summarize the results obtained.
at Zoom Meeting ID: 236 122 4872

27 Apr 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Bernard Brickwedde/Jan Lommler, Institut für Physik
Deep Learning
at Zoom

28 Apr 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Magdalena Kowalska, CERN/ U Genf
When we polarise the spins of unstable nuclei, their beta emission will be asymmetric, due to the parity non-conservation of the weak interaction. This feature has been used by our team in a variety of fields. It is a way to look for New Physics through the determination of the Vud matrix element of the CKM quark mixing matrix in nuclear mirror decays. In nuclear physics, in allows to apply an ultrasensitive type of NMR (called beta-NMR) to determine the magnetic dipole moments and electric quadrupole moments of short-lived nuclei. Recently, we have started applying beta-NMR to chemistry and biology, since its sensitivity is up to a billion times higher than in conventional NMR. In this talk I will introduce spin polarisation via optical pumping and beta-NMR principles. I will present our experimental setup located at CERN/ISOLDE. Finally, I will discuss the three scientific topics: Vud from 35Ar decay, magnetic moment of 26Na with ppm accuracy, and the interaction of Na with DNA G-Quadruplex structures .
at Recording of the presentation

29 Apr 2020

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

10:30 Uhr s.t.

Michael Slota, Department of Materials, University of Oxford, OX1 3PH, UK
Molecular Spin Nanostructures
at Skype for Business

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

15:00 Uhr s.t.

Max Hänze, 1. University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany. 2. Max Planck Institute for Solid State Research, Stuttgart, Germany.
Spin Dynamics: from Microstructures to Individual Atoms
at Skype for Business

30 Apr 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Dr. Karolina Kulesz, CERN, Geneve
GammaMRI project aims to develop a new medical imaging modality able to overcome the limitations of existing imaging techniques and to combines their advantages. Gamma-MRI introduces the spatial resolution of MRI, the sensitivity of nuclear medicine (PET and SPECT) and possible clinical benefits of xenon isotopes [1,2]. At the same time, it eliminates drawbacks of the above-mentioned techniques. Our team is at present working on a proof-of-concept experiment. Gamma-MRI is based on the detection of asymmetric γ-ray emission of long-lived polarized nuclear states in the presence of magnetic fields [2]. The nuclei used in our study are long-lived nuclear isomers of Xe isotopes: 129mXe (T1/2 = 9 d),131mXe (T1/2 = 12 d) and 133mXe (T1/2 = 2 d) produced at the ILL high flux reactor in Grenoble or at ISOLDE facility at CERN [3]. The isomers of Xe are then hyperpolarized via collisions with laser-polarized rubidium vapor (Spin Exchange Optical Pumping) [4]. Once polarized and placed inside a magnetic field, they emit γ-rays whose direction of emission depends on the degree of spin polarization. Emitted radiation is acquired with CeGAAG crystals coupled to Si photodetectors and readout electronics compatible with strong magnetic fields, which are able to support very high count-rates. Once high polarization is successfully acquired, similar procedure can be used to record the spins’ response to rf pulses in gradient magnetic field, which is up to 105 more sensitive than usual signal pick-up in rf coils. References: [1] R. Engel, Master thesis 2018, https://cds.cern.ch/record/2638538. [2] Y. Zheng et al., Nature 537, 652 (2016). [3] M. Kowalska et al., Letter of Intent, CERN-INTC-2017-092 / INTC-I-205 (2017). [4] T. G. Walker and W. Happer, Rev. Mod. Phys. 69, 629 (1997).

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

10:30 Uhr s.t.

Naëmi Leo, CIC nanoGUNE, Donostia, San Sebastian, Spain
Artificial Spin Ice: From Frustration to Computation
at Skype for Business

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

15:00 Uhr s.t.

Alan Farhan, Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, FI-00076 Aalto, Finland
Frustrated spin architecture: from macroscopically degenerate artificial spin ice to artificial spin glasses
at Skype for Business

04 May 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Ralf Gugel, Institut für Physik
Measurement of Higgs boson production via gluon fusion and vector-boson fusion in the H → WW* decay mode with the ATLAS experiment at the LHC at √s = 13 TeV
at Zoom

05 May 2020

Theorie-Palaver

Institut für Physik

14:30 Uhr s.t.

Filippo Sala, CNRS Paris Jussieu
Sub-GeV Dark Matter particles upscattered by cosmic rays gain enough kinetic energy to pass the thresholds of large volume detectors on Earth. I will show how public Super-Kamiokande and MiniBooNE data already exclude previously allowed regions of both DM-electron and DM-nucleon interactions. I will then discuss search strategies and prospects at existing and planned neutrino facilities, such as Hyper-K, DUNE, IceCube and KM3NeT.
at Zoom

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Joachim Peinke, Universität Oldenburg
The current development of wind energy is summarised, and it is shown that wind energy has become one of the cheapest ways to produce electrical energy. From the perspective of a physicist there are several challenging research questions which arise, although wind energy systems have been used already over several centuries. A central point of this talk will be to show how fundamental research in physics can contribute to the modern development of wind energy systems.
at Recording of the presentation

07 May 2020

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

Institut für Physik

17:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Prof. Dr. Monika Schleier-Smith, Stanford University, USA
The dream of the quantum engineer is to have an “arbitrary waveform generator” for designing quantum states and Hamiltonians. Motivated by this vision, I will report on advances in optical control of long-range interactions among cold atoms. Our lab is exploring two approaches: photon-mediated and Rydberg-mediated interactions. By coupling atoms to light in an optical resonator, we generate tunable non-local Heisenberg interactions, characterizing the resulting phases and dynamics by real-space imaging. Notable observations include photon-mediated spin-mixing—a new mechanism for generating correlated atom pairs—and interaction-based protection of spin coherence. In a separate platform, we employ Rydberg dressing to induce Ising interactions in a gas of cesium atoms in their hyperfine clock states, enabling the realization of a Floquet transverse-field Ising model. I will discuss prospects in quantum simulation and quantum metrology promised by the versatility of optical control.

Achtung: Uhrzeit geändert!

11 May 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Simone Schuchmann, Institut für Physik
NA62: The Kaon Factory @ CERN
at Zoom

12 May 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., online (zoom oder BigBlueButton)

Jeff Hangst, Aarhus University
COLLOQUIUM CANCELLED!

COLLOQUIUM CANCELLED!

14 May 2020

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

Institut für Physik

17:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Prof. Dr. Kai-Mei Fu, Depts of Physics and Electrical and Computer Engineering, University of Washington, Seattle, USA
Single defects in crystals, often termed “quantum defects”, are promising qubit candidates for quantum network applications. I will first provide an overview of the types of properties we seek in single defects, how we create these defects and how we measure them, illustrated with examples from my group’s research. I will then present the semiconductor-on-diamond integrated photonics platform my group is developing to scale networks of many entangled quantum defects.

Achtung: Uhrzeit geändert!

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., Newtonraum, 01-122, Staudingerweg 9

Maike Jung, Institut für Physik
Modeling Membrane Dynamics on the Level of Organelles
at Zoom

18 May 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Antoine Laudrain, Institut für Physik
Calibration of the ATLAS electromagnetic calorimeter
at Zoom

19 May 2020

Theorie-Palaver

Institut für Physik

14:30 Uhr s.t.

Alexander Ochirov, ETH Zurich
In view of the recent observations of gravitational-wave signals from black-hole mergers, classical black-hole scattering has received considerable interest due to its relation to the classical bound-state problem of two black holes inspiraling onto each other. In this talk I will discuss the link between classical scattering of spinning black holes and quantum scattering amplitudes for massive spin-s particles. Starting at first post-Minkowskian (PM) order, I will explain how the spin-exponentiated structure of the relevant tree-level amplitude follows from minimal coupling to Einstein's gravity and in the \(s \rightarrow \infty \) limit generates the black holes' complete series of spin-induced multipoles. The resulting scattering function will be shown to encode in a simple way the known net changes in the black-hole momenta and spins at 1PM order and to all orders in spins. Then I will move on to the new results at 2PM order for the case of aligned black holes' spins and discuss the current state of the art for classical black-hole scattering.
at Zoom

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Jan Meijer, Universität Leipzig
The key technology to fabricate quantum devices, i.e. devices that employ single atoms or defects as functional unit is the addressing of single atoms in a solid with high lateral resolu-tion. Whereas the manipulation of single atoms at the surface has been possible since several years, the three dimensional addressing in the bulk requires more effort. The combination of surface manipulation and overgrowth is one possibility but technologically very challenging. Ion beam implantation allows addressing single countable atoms inside a given solid with nanometer precision. To meet this goal we firstly need to focus or collimate the ion beam and to count the ions delivered to the sample. Our approach is to detect a single ion during fly-by using image charge detection and to deliver the ion with nanometer precision employ-ing a modified commercial FIB system. However, to create a deterministic quantum register based on NV centers a third requirement has to be considered: The implanted nitrogen atom has to be converted into an NV center with nearly 100% efficiency. Unfortunately, the creation of vacancies by ion impact is a statistical process and therefore not predictable. Additionally, the charge state of the NV center has to be converted into the negative state to make it functional. The talk will discuss the state of the art of single ion nano-implantation methods as well as new developments in material science to overcome the limitations encountered in the crea-tion of NV centers so far.
at Recording of the presentation

25 May 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Alexander Fritz/Seva Orekhov, Institut für Physik
Supernova
at Zoom

26 May 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Achim Rosch, Universität Köln
Magnetic skyrmions are tiny, topologically quantized magnetic whirls stabilized by relativistic spin-orbit interactions. They couple extremely efficiently to charge-, spin- and heat currents and can be manipulated by ultra small forces. They are therefore promising candidates for, e.g., future magnetic memories. The coupling of skyrmions to electrons can efficiently be described by artifical electromagnetic fields. We explore how these fields can be measured. Phase transitions in and out of the skyrmion phase are driven by topological point defects which can be identified as emergent magnetic monopoles.
at Zoom

28 May 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Prof. Dr. Herwig Ott, Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany
Ultracold quantum gases are usually well isolated from the environment. This allows for the study of ground state properties and non-equilibrium dynamics of many-body quantum systems under almost ideal conditions. Introducing a controlled coupling to the environment “opens” the quantum system and non-unitary dynamics can be investigated. Such an approach provides new opportunities to study fundamental quantum phenomena and to engineer robust many-body quantum states. I will present an experimental platform [1,2] that allows for the controlled engineering of dissipation in ultracold quantum gases by means of localized particle losses. This is exploited to study quantum Zeno dynamics in a Bose-Einstein condensate [3], where we find that the particle losses are well described by an imaginary potential in the system’s Hamiltonian. We also investigate the steady-states in a driven-dissipative Josephson array [4]. For small dissipation, the steady-states are characterized by balanced loss and gain and the eigenvalues are real. This situation corresponds to coherent perfect absorption [5], a phenomenon known from linear optics. Above a critical dissipation strength, the system decays exponentially, indicating the existence of purely imaginary eigenvalues. We discuss our results in the context of dissipative phase transitions. References [1] T. Gericke et al., Nature Physics 4, 949 (2008). [2] P. Würtz et al., Phys. Rev. Lett. 103, 080404 (2009). [3] G. Barontini et al., Phys. Rev. Lett. 110, 035302 (2013). [4] R. Labouvie et al. Phys. Rev. Lett. 116, 235302 (2016). [5] A. Müllers et al. Science Advances 4, eaat6539 (2018).

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., Newtonraum, 01-122, Staudingerweg 9

Prof. Dr. Hossein Eslami, Chemistry Dept. TU Darmstadt
Self-assembly of Janus particles
at Zoom, email settanni@uni-mainz.de

02 Jun 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t.

Laura Baudis, University of Zurich
Neutrinos are the only known elementary particles that are Majorana fermion candidates, implying that they would be their own antiparticles. The most sensitive and perhaps only practical probe of the Majorana nature of neutrinos is an extremely rare nuclear decay process, the double beta decay without the emission of neutrinos. After an introduction to the physics of neutrinoless double beta decay, I will present the experimental techniques to search for this exceedingly rare process. I will show the latest results from leading experiments in the field, then discuss future projects and their prospects to probe the inverted neutrino mass ordering scenario.
at Zoom (for more details see below)

04 Jun 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Dr. Hélène Perrin, Université de Paris 13, Sorbonne, Paris Cite, France
In this talk, I will discuss the dynamics of a superfluid quantum Bose gas confined at the bottom of a shell rf-dressed trap. Weakly interacting quantum degenerate atoms present a superfluid behavior, characterized by several properties including the emergence of specific collective modes at low energy or the apparition of quantum vortices when the fluid is set into rotation. In the talk I will describe the collective dynamical behavior of the atoms confined in this very smooth potential, from the low excitation regime where the first collective modes are observed to the fast rotation limit where the bubble shape of the trap plays an essential role.

zukünftige Termine
09 Jun 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., online (zoom oder BigBlueButton)

Martin Fertl, JGU Mainz
Muon g-2: Comparing the Muon’s Clocks to Test the Standard Model of Particle Physics

Theorie-Palaver

Institut für Physik

16:00 Uhr s.t.

Elina Fuchs, Chicago U. & Fermilab
Complex Yukawa couplings of the Higgs boson have interesting implications for Higgs production and decay rates, EDMs and CP violation for electroweak baryogenesis. I will present if there are viable regions fulfilling all of these three complementary constraints, for real and imaginary dimension-six terms of the tau, muon, top and bottom. After considering each flavor separately, I will show that combinations of several sources allow for cancellations in the EDM and an enhancement of the baryon asymmetry.
at Zoom

11 Jun 2020

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., Newtonraum, 01-122, Staudingerweg 9

Ashreya Jayaram, Institut für Physik, JGU, PhD student
Collective Behaviour of Anisotropic Active Particles

15 Jun 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Daniel Wenz/Johannes Balz, Institut für Physik
Dark Matter
at Zoom

16 Jun 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., online (zoom oder BigBlueButton)

Joachim Mnich, DESY
European particle physics strategy?

Theorie-Palaver

Institut für Physik

14:30 Uhr s.t., Zoom

Gustavo Marques Tavares, Johns Hopkins U.
TBA

18 Jun 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Dr. Angela Papa, PSI Villigen
tba

23 Jun 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., online (zoom oder BigBlueButton)

Elena Aprile, Columbia University
Direct searches for Dark Matter

25 Jun 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Prof. Dr. Jakob Reichel, Laboratoire Kastler Brossel, ENS Paris, France
Many if not all future quantum technologies are enabled by quantum correlations in a well-controlled many-particle system. In ensembles of atoms, ions and many other quantum emitters, such correlations can be generated with a high-finesse optical cavity. This approach is particularly promising for quantum metrology. I will present an experiment combining a compact trapped-atom clock on an atom chip and a fiber Fabry-Perot microcavity. This first "metrology-grade" spin squeezing experiment enabled us to produce spin squeezed states with unprecedented lifetime up to a second, and to observe a "quantum phase magnification" effect due to the subtle interplay of these many-particle entangled states with the exchange interaction that occurs in the trapped low-temperature gas.

29 Jun 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t.

Elisa Ruiz-Chóliz/Phi Chau, Institut für Physik
ALPS
at Zoom

30 Jun 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., online (zoom oder BigBlueButton)

Jo van den Brand, Nikhef
Gravitational waves

02 Jul 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Dr. Philipp Schindler, Institut für Experimentalphysik, Uni Innsbruck, Österreich
I will review our effort to build scalable quantum information processors with trapped atomic ions. In particular, I will focus on experiments to benchmark quantum operations that allow to predict the performance of quantum error correction. I will then discuss how to adapt these operations and benchmarking techniques to characterize ultrafast dynamics in single molecular ions.

07 Jul 2020

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., online (zoom oder BigBlueButton)

Paul Dodds, University College London
Hydrogen economy

09 Jul 2020

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

Institut für Physik

14:00 Uhr s.t., https://zoom.us/j/94520261050 (Passwort-Anfrage an "stuckker@uni-mainz.de")

Dr. Claudiu Genes, MPI for the Science of Light, Erlangen
Optical photons typically carry very little energy and momentum. Despite this, they can still be successfully employed to control the motion of various objects ranging from small molecules to macroscopic vibrating mirrors or membranes. We theoretically employ stochastic methods to show how light can be used to read out vibrations of nuclei in molecules [1] or to cool down the motion of photonic crystal mirrors [2] or membranes [3], close to their quantum ground state. [1] M. Reitz, C. Sommer and C. Genes, Langevin approach to quantum optics with molecules, Phys. Rev. Lett. 122, 203602 (2019). [2] O. Cernotik, A. Dantan and C. Genes, Cavity quantum electrodynamics with frequency-dependent reflectors, Phys. Rev. Lett. 122, 243601 (2019). [3] C. Sommer and C. Genes, Partial optomechanical refrigeration via multi-mode cold damping feedback, Phys. Rev. Lett. 123, 203605 (2019).