Europhys. Lett.
Volume 65, Number 6, March 2004
Page(s) 749 - 752
Section General
Published online 01 March 2004
Europhys. Lett., 65 (6) , pp. 749-752 (2004)
DOI: 10.1209/epl/i2004-10001-5

Collective oscillations of a trapped superfluid Fermi gas near a Feshbach resonance

S. 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.

© EDP Sciences 2004