Finite-Temperature Collective Dynamics of a Fermi Gas in the BEC-BCS Crossover

Details Finite-Temperature Collective Dynamics of a Fermi Gas in the BEC-BCS Crossover Finite-Temperature Collective Dynamics of a Fermi Gas in the BEC-BCS Crossover

2007-07-24

arxiv.org/abs/0707.3593v1

Phys.Rev.Lett.99:150403,2007

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.99.150403

We report on experimental studies on the collective behavior of a strongly interacting Fermi gas with tunable interactions and variable temperature. A scissors mode excitation in an elliptical trap is used to characterize the dynamics of the quantum gas in terms of hydrodynamic or near-collisionless behavior. We obtain a crossover phase diagram for collisional properties, showing a large region where a non-superfluid strongly interacting gas shows hydrodynamic behavior. In a narrow interaction regime on the BCS side of the crossover, we find a novel temperature-dependent damping peak, suggesting a relation to the superfluid phase transition.

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