Calendar of Physics Talks Vienna

Strongly interacting few fermion systems: from pairing to elliptic flow
Speaker:Sandra Brandstetter (Universität Heidelberg)
Abstract:Elliptic flow, the redistribution of energy between axes during the expansion due to anisotropic pressure gradients, is considered a signature of hydrodynamics. It has been observed in systems ranging from ultracold quantum gases (1) to heavy ion collisions (2), where surprisingly small systems show elliptic flow. Our cold atom experiment opens up a new pathway to study elliptic flow in few body systems with an unprecedented control over its microscopic parameters. We start by deterministically preparing a small number of ultracold fermionic Li6 in the ground state of an elliptically-shaped optical trap and study the dynamics of the system after release from the trap at different interaction strengths and particle numbers (3). Owing to our experimental ability to measure both momentum- and real- space density with single particle resolution we observe the redistribution of momenta as wel
Date: Wed, 07.02.2024
Time: 16:15
Location:Atominstitut Hörsaal
Contact:Julian Léonard

Exploring Dissipative and Coherent Spin Dynamics with Superradiant Quantum Gases
Speaker:Rodrigo Rosa-Medina (ETH Zurich)
Abstract:Experiments combining ultracold atoms and high-finesse optical cavities provide a versatile platform for engineering strong and tunable photon-mediated interactions. By selectively addressing the atomic motional and spin degrees of freedom, we can explore the interplay between coherent and controlled dissipative many-body dynamics. In this talk, I will present a series of experiments employing a spinor Bose-Einstein condensate (BEC) of 87Rb atoms coupled to a high-finesse optical cavity. First, we exploit Dicke superradiance to engineer dynamical tunneling in a synthetic lattice geometry [1]. Two incident laser drives induce cavity-assisted Raman transitions between discrete momentum modes of a two-component BEC, which we interpret as photon-assisted tunneling in a momentum-space lattice. By monitoring the cavity leakage, we gain real-time access to the emergent lattice currents and dete
Date: Thu, 08.02.2024
Time: 14:00
Duration: 45 min
Location:Helmut Rauch Hörsaal ATI
Contact:Julian Leonard