Collective oscillations of a trapped Fermi gas near a Feshbach resonance

Abstract

The frequencies of the collective oscillations of a harmonically trapped Fermi gas interacting with large scattering lengths are calculated at zero temperature using hydrodynamic theory. Different regimes are considered, including the molecular Bose-Einstein condensate and the unitarity limit for collisions. We show that the frequency of the radial compressional mode in an elongated trap exhibits a pronounced non monotonous dependence on the scattering length, reflecting the role of the interactions in the equation of state.

3 pages, including 1 figure

References in corpus (4)

• Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms
• Observation of Bose-Einstein Condensation of Molecules
• Superfluid Fermi Gases with Large Scattering Length
• Spectroscopic insensitivity to cold collisions in a two-state mixture of fermions

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