Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.51: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Sound propagation and damping in a homogeneous two-dimensional Fermi gas — •Markus Bohlen1,2,3, Lennart Sobirey1,2, Niclas Luick1,2, Hauke Biss1,2, Thomas Lompe1,2, and Henning Moritz1,2 — 1Institut für Laserphysik, Universität Hamburg — 2The Hamburg Center for Ultrafast Imaging, Universität Hamburg — 3École Normale Supérieure, Paris
Understanding transport in strongly interacting systems remains one of the major challenges in quantum many-body physics. In this context, two-dimensional systems are particularly intriguing due to their strong quantum fluctuations and their approximate scale invariance. Here, we present measurements of the sound propagation in a strongly interacting 2D Fermi gas across the 2D BEC-BCS crossover. We excite particle currents by imprinting a phase step onto homogeneous Fermi gases trapped in a box potential and measure the resulting density oscillations. We extract the speed of sound across the BEC-BCS crossover and compare the resulting dynamic measurement of the compressibility equation of state to a static measurement based on recording density profiles as well as a QMC calculation and find reasonable agreement between all three. Finally, we also measure the damping of the sound mode and find a clear minimum in the strongly interacting regime in agreement with quantum limited transport.