SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.27: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Stability and vulnerability of quantum gases along the BEC-BCS crossover with quenched disorder — •Felix Lang, Jennifer Koch, Sian Barbosa, and Artur Widera — Physics Department and Research Center OPTIMAS, University of Kaiserslautern-Landau, Germany

Quantum fluids in the so-called BEC-BCS crossover show very different microscopic pairs underlying the superfluid. This changing pairing might also change the response to perturbations of the system. We investigate the response of a molecular BEC and of a resonantly interacting Fermi gas to quenches into and out of an optical disorder potential. We monitor the response of the in-situ density distribution as well as the ability for hydrodynamic expansion, which we interpret as a measure of long-range phase coherence. Concerning the latter, we find that the BEC recovers hydrodynamic expansion after disorder quenches on time scales which can be related to energy scales in the system, whereas the unitary Fermi gas permanently loses its ability for hydrodynamics. We attribute this observation to an efficient breaking of Fermi pairs in the BEC-BCS crossover. Our work sheds light on the mechanisms underlying the superfluid pairing in interacting Fermi gases.