Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.14: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

Towards second sound in a quasi two dimensional Fermi gas — •Daniel Hoffmann, Thomas Paintner, Wolfgang Limmer, and Johannes Hecker Denschlag — Universität Ulm, Institut für Quantenmaterie, Deutschland

Excitations in ultracold quantum gases have become a versatile tool to unveil fundamental thermodynamics. Especially the properties of superfluidity have been investigated extensively using local or global excitations. One phenomena which has recently been demonstrated in a quantum gas experiment is second sound excitation (see [1]). In this experiment entropy waves were excited in a suprafluid/normal fluid mixture and were detected by means of density modulation.

In the project presented here, we extend the work on second sound to quasi two dimensional gases. We use a degenerate Fermi gas of ⁶Li loaded into a highly anisotropic trap, where the conditions of a quasi 2D Fermi gas can be fulfilled. To excite second sound, we use an intensity-modulated laser beam focused on the trap center to generate entropy waves. Detecting density modulations in the Fermi gas enables us to extract the second sound excitation. Our presentation shows first results towards second sound in a quasi 2D interacting Fermi gas.

[1]: Sidorenkov et al., Nature 498, 78-81 (2013)