Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantengase (Bosonen II / Fermionen)

Q 47.7: Talk

Thursday, March 13, 2008, 18:00–18:15, 1A

Dissipative dynamics of a rotating, strongly-interacting Fermi gas. — •Edmundo R. Sánchez Guajardo, Stefan Riedl, Christoph Kohstall, Alexander Altmeyer, Johannes Hecker Denschlag, and Rudi Grimm — Institut für Experimentalphysik, Technikerstrasse 25/4, A-6020 Innsbruck

We present our experiments on dissipative dynamics of a rotating ultracold gas of strongly interacting ⁶Li atoms in a harmonic trap. In such a system both the superfluid core and the surrounding thermal gas are hydrodynamic, in contrast to weakly interacting BEC experiments where the thermal gas is collisionless. This leads to particularly long lifetimes of rotation of the thermal part, allowing for precise measurement of the angular momentum. We measure the lifetime of the angular momentum for different temperatures and trap anisotropies using collective oscillations. The measurements are in excellent agreement with the theoretical exponential decay previously predicted [Guéry-Odelin, 2000].