Collective oscillations of a trapped superfluid Fermi gas near a Feshbach resonanceS. Stringari
Dipartimento di Fisica, Università di Trento and BEC-INFM I-38050 Povo (TN), Italy
(Received 5 January 2004; accepted 14 January 2004)
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.
03.75.-b - Matter waves.
03.75.Ss - Degenerate Fermi gases.
67.40.Db - Quantum statistical theory; ground state, elementary excitations.
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