Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 26: Ultracold atoms, ions, and BEC IV (joint session A/Q)
Q 26.4: Talk
Wednesday, March 11, 2020, 12:00–12:15, f303
Probing the role of long-range coherence for superfluid dynamics by disorder quenches — •Jennifer Koch1, Benjamin Nagler1,2, Sian Barbosa1, and Artur Widera1,2 — 1Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, 67663 Kaiserslautern, Germany
Quantum fluids exhibit a well-defined phase, which can be interferometrically measured. The direct connection of long-range coherence with superfluid transport and expansion dynnamics is, however, challenging to access experimentally. I report on experimentally revealing the role of long-range coherence for superfluid flow in an interacting gas of 6Li atoms, quenched into and out of optical disorder. I will discuss our investigations about the density and superfluid-expansion response of a molecular Bose-Einstein condensate after quenching. We measure the breakdown and reoccurrence of superfluid hydrodynamics. We track the response times on which the system relaxes to a new equilibrium and relate the time scales to fundamental energy scales of the system. Our results shed light onto the importance of long-range phase coherence for superfluid flow, and also suggest a possible route of studying complex phase dynamics in superfluids by imprinting disordered phases.