Programm Wintersemester 2022/2023
Mo. 07.11.2022, 16:30 (online)
Nora Lützgendorf (STScI Baltimore)
The James Webb Space Telescope - a record breaker in astronomy
Host: David DiVincenzo
Mo. 21.11.2022, 16:15 Physik Hörsaal, 28 D 001, hybrid
Gwenhaël de Wasseige (UC Louvain)
Another look on the Universe
Most of what we know about your Universe has been revealed using light. The centuries have brought us a larger variety of instruments to observe the sky in every wavelength. Some of the phenomena happening in our Universe may however not be observable with light. In the past decades, new detection techniques brought us the ability to study the most energetic astrophysical objects with other 'messengers'. This colloquium will review how these messengers could lead us to see the Universe in a bright new way. We will especially focus on telescopes that are working from some of the most extreme locations on Earth, such as the bottom of the sea or the ice of the South Pole, to detect what cannot be detected: neutrinos.
Host: Philipp Mertsch
Mo. 05.12.2022, 16:15 Physik Hörsaal, 28 D 001
Johannes Erdmann (RWTH Aachen University)
Massive particles in massive data
The top quark and the Higgs boson are the heaviest particles known to date. At the Large Hadron Collider, they are produced abundantly, which allows to measure them with unprecedented precision. These measurements have the potential to uncover new physical phenomena in production and decay mechanisms as well as in rare production processes that are now experimentally accessible. The colloquium will review recent results and outline future directions, focussing on the development of new methods.
Host: Alexander Schmidt
Mo. 19.12.2022, 16:15 Physik Hörsaal, 28 D 001
Dmitri K. Efetov (LMU München)
Plethora of Many-Body Ground States in Magic Angle Twisted Bilayer Graphene
Twist-angle engineering of 2D materials has led to the recent discoveries of novel many-body ground states in moiré systems such as correlated insulators, unconventional superconductivity, strange metals, orbital magnetism and topologically nontrivial phases. These systems are clean and tuneable, where all phases can coexist in a single device, which opens up enormous possibilities to address key questions about the nature of correlation induced superconductivity and topology, and allows to create entirely novel quantum phases with enhanced interactions. In this talk we will introduce some of the main concepts underlying these systems, concentrating on magic angle twisted bilayer graphene (MATBG) and show how symmetry-broken states emerge at all integer electron fillings . We further will discuss recent experiments including screened interactions , Chern insulators , magnetic Josephson junctions , quantum criticality , re-entrant correlated insulators at high magnetic fields , Dirac spectroscopy of correlated states in magic angle trilayers and discuss some of the avenues for novel quantum sensing applications .
Host: Christoph Stampfer
Mo. 09.01.2023, 16:30 Physik Hörsaal, 28 D 001
Klemens Hammerer (Leibniz Universität Hannover)
Titel: Quantum Technology for Frequency Metrology
Optical atomic clocks based on cold trapped ions offer the possibility to use the sophisticated tools of quantum control developed for quantum information processing for new protocols in frequency metrology. I will present results on optimizing such protocols for tailored states and measurements for ion clocks, optimized via variational optimization of suitable quantum circuits. Beyond trapped ion clocks, I will also discuss prospects and challenges for quantum-assisted protocols in optical atomic clocks based on squeezed states.
Host: Markus Müller
Mo. 23.01.2023, 16:15 Physik Hörsaal, 28 D 001
Karl Jakobs (Universität Freiburg)
The Higgs Boson and the Future of Particle Physics
During the past decade the experiments at the Large Hadron Collider at CERN have successfully explored a new energy regime at the TeV scale. The excellent performance of the accelerator and of the experiments allowed for the discovery of the long-sought Higgs boson and the measurement of its properties. In the talk, a summary of the achieved results, with focus on the Higgs boson, is presented.
It will be further discussed how the open key questions of particle physics can be addressed in the near and longer-term future. In this discussion the focus is put on the central role of a future large collider and on possible realisation scenarios.
Seit mehr als 25 Jahren ist Prof. Dr. Karl Jakobs an den Experimenten der Teilchenphysik bei höchsten Energien beteiligt. Er forschte an verschiedenen Experimenten am CERN in Genf und am US-Forschungslabor Fermilab in der Nähe von Chicago. An der Konzeption, am Bau und an der Datenanalyse des ATLAS-Experiments am Large Hadron Collider (LHC) war er maßgeblich beteiligt. Für seine herausragenden Beiträge zur Entdeckung des Higgs-Teilchens erhielt er 2015 die Stern-Gerlach-Medaille, die höchste Auszeichnung für experimentelle Leistungen, der Deutschen Physikalischen Gesellschaft (DPG). Neben der Erforschung des Higgs-Teilchens steht die Suche nach sogenannten supersymmetrischen Teilchen im Vordergrund seines Interesses. Von 2017 bis 2021 war er der wissenschaftliche Leiter (Spokesperson) des ATLAS-Experiments am CERN.
Host: Lutz Feld