Current dates

27. Week 2022


Monday, 07. 4.

Special Seminar

Time, Place:

10:50 ,Zoom

Speaker:

Prof. Dr. Wolfram Pernice, Kirchhoff Institute for Physics / Heidelberg University

Title:

Photonic integrated circuits for unconventional computing

LINK: https://zoom.us/j/94709998383?pwd=THFpaDBSNld1QmV2NSsycUkwdVJLQT09 \\MEETING ID: 947 0999 8383 \\PASSCODE: 111470 \\

Special Seminar

Time, Place:

11:40 ,Zoom

Speaker:

Prof. Dr. Felix Deschler, Institute of Physical Chemistry / Heidelberg University

Title:

Control of Spin-Orbit Interactions in Hybrid Metal-Halide Perovskites using Magnetic Doping and Chirality

LINK: https://zoom.us/j/94709998383?pwd=THFpaDBSNld1QmV2NSsycUkwdVJLQT09 \\ MEETING ID: 947 0999 8383 \\ PASSCODE: 111470 \\

Tuesday, 07. 5.

Seminar Theoretische Quantendynamik

Time, Place:

11:15 ,Otto Hahn lecture hall, library building

Speaker:

Lukas Wolff, MPIK

Title:

Towards Two-Dimensional Spectroscopy in Nuclear Resonant Scattering

Wednesday, 07. 6.

Seminar Dynamik und Struktur von Atomen und Molekülen

Time, Place:

09:30 ,Hybrid seminar: Otto Hahn lecture hall, library building; https://zoom.us/j/96940738745?pwd=L1B5RXlNTFNqdGxWaXdlMnRtNkUxUT09

Speaker:

Weiyu Zhang, Ionizing atoms&molecules in strong fields

Title:

Strong-field ionization of CH4

Meeting-ID: 969 4073 8745Kenncode: 740318

Bothe-Kolloquium

Time, Place:

11:15 ,Otto Hahn lecture hall, library building; https://zoom.us/j/92548552219?pwd=UCs5RFVlcGpzZWdpb0ZhYUUxUWdkZz09

Speaker:

Viktor Chikán, Ultrafast Dynamics Group, ELI-ALPS

Title:

Development of step scan FTVIS experimental methodology at the Extreme Light Infrastructure Attosecond Light Pulse Source (ELI-ALPS) research facility to explore photoinduced chemical reactions in intense terahertz fields

Meeting-ID: 925 4855 2219Kenncode: 505342

Kaffeepalaver

Time, Place:

11:15 ,Central seminar room, library building

Speaker:

Dr. Renate Hubele

Title:

tba

Thursday, 07. 7.

Kaffeepalaver

Time, Place:

11:15 ,Hybrid seminar: Otto Hahn Lecture hall, library building + Zoom: https://zoom.us/j/93897582983?pwd=c3V5UUxnTDRUOTAxM1hlSjM3VFN1UT09, Meeting-ID: 938 9758 2983, Kenncode: 138928

Speaker:

Pei-Lun He (Division Theoretical Quantum Dynamics and Quantum Electrodynamics)

Title:

Nondipole Time Delay in Tunneling Ionization

Tunneling time is a controversial topic ever since the birth of quantum mechanics. The development of modern laser technology, especially the invention of the attoclock, has brought both new insights and debates into the question. Nondipole effects, which originate from the finiteness of the light speed, could result in a new kind of ionization time delay. Here we discuss nondipole effects in strong-field ionization and its resulting ionization time delay. Using the Coulomb-corrected light-front strong-field approximation, we investigate the photon momentum transfer in strong-field ionization. Despite its attractive nature, the under-the-barrier Coulomb field counterintuitively increases the photoelectron momentum shift. For molecules, we apply the Wigner transformation to extract tunneling exit distributions and show that the corresponding nondipole time delay is generally independent of the bond length. We also identify the double-slit interference in tunneling ionization of atoms with nonzero angular momentum via a nondipole momentum shift.

28. Week 2022


Monday, 07.11.

Particle and Astroparticle Theory Seminar

Time, Place:

16:30 ,Zoom

Speaker:

Dr. Peter Denton (Brookhaven)

Title:

Sterile neutrinos at 1 eV

https://zoom.us/j/94148305916?pwd=alc3V2MwYXBTWGxwSnNjL2QyWG5kQT09Sterile neutrinos are a component of many extremely well motivated explanations of neutrino masses.While m_4~1eV is not a mass range desired theoretically, it is one that is relatively straightforward to probe experimentally. In this talk I will review the existing hints and constraints on light sterile neutrinos. In particular I will show how cosmological constraints compare with terrestrial constraints and provide speculation on how these constraints might be different. Finally, I will discuss the latest results from MicroBooNE and the path forward.

Wednesday, 07.13.

Seminar Dynamik und Struktur von Atomen und Molekülen

Time, Place:

09:30 ,hybrid seminar: Otto Hahn lecture hall, library building; https://zoom.us/j/96940738745?pwd=L1B5RXlNTFNqdGxWaXdlMnRtNkUxUT09

Speaker:

Dr. Michael Schulz, Department of Physics, Missouri University of Science & Technology, Rolla, MO

Title:

Few-Body Dynamics in Basic Atomic Fragmentation Processes

Meeting-ID: 969 4073 8745Kenncode: 740318

Gentner Colloquium for Astroparticle Physics

Time, Place:

15:00 ,hybrid colloquium: central seminar room, library building; link see below

Speaker:

Prof. Jeff Martoff Ph.D., Temple University of California Berkeley

Title:

The HUNTER Sterile Neutrino Search

https://zoom.us/j/97603959912?pwd=ajBDN3RMUmxuOUQ5WitzY3EzUzZsdz09Abstract: The HUNTER experiment (Heavy Unseen Neutrinos from Total Energy-momentum Reconstruction)uses missing-mass reconstruction of electron-capture beta decays to search for sterile neutrinos with masses in the 20-280 keV range. We detect electron-capture decays of radioactive 131-Cs atoms, contained in a magneto-optical (laser) trap. The decay produces only low-energy products. Charged products will be measured with part-per-mille resolution and up to 4\pi collection efficiency using precision electrostatic spectrometers (this is MOTRIMS- Magneto-Optical trap-Reaction Ion Microscopy). K x-rays will be detected in a YAP scintillator array. Mounting of HUNTER is in progress now at the UCLA experiment site. The apparatus also makes possible other sensitive searches for BSM physics in beta decays.

Thursday, 07.14.

Teekolloquium

Time, Place:

11:15 ,Otto-Hahn Hörsaal (Hybrid-Format)

Speaker:

Prof. Dr. Kathrin Valerius - Karlsruher Institut für Technologie

Title:

Probing the neutrino mass: recent results of the KATRIN experiment

https://zoom.us/j/93897582983?pwd=c3V5UUxnTDRUOTAxM1hlSjM3VFN1UT09Meeting-ID: 938 9758 2983Kenncode: 138928Precision measurements of the kinematics of weak decays offer a direct and mostly model independent approach to probe the absolute neutrino mass scale. The KArlsruhe TRItium Neutrino experiment (KATRIN) searches for the minute imprint of the neutrino mass in the endpoint region of the tritium beta decay spectrum. KATRIN employs a high-intensity gaseous molecular tritium source and a high-resolution electrostatic filter with magnetic adiabatic collimation to target a neutrino-mass sensitivity of 0.2 eV after five years of data-taking.Based on its initial two science runs, KATRIN has already substantially improved kinematic neutrino mass bounds -- recently achieving the first direct constraint at sub-eV sensitivity. In addition, KATRIN has begun to address further science channels such as the direct search for light sterile neutrinos. As larger data sets are collected and further improvements in terms of signal-to-background ratio and systematics are being achieved, KATRIN is continuing its exploration of the sub-eV neutrino mass parameter space and its search for BSM physics in precision beta decay spectroscopy.