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

Abstract

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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Cited by in corpus (48)

• Theory of ultracold Fermi gases
• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• Thermodynamic Measurements in a Strongly Interacting Fermi Gas
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• Moment of Inertia and Dynamical Rotational Response of a Supersolid Dipolar Gas
• Role of fourth-order phase-space moments in collective modes of trapped Fermi gases
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• Breathing Mode of a Bose-Einstein Condensate Immersed in a Fermi Sea
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