Temperature and finite-size effects in collective modes of superfluid Fermi gases

Abstract

We study the effects of superfluidity on the monopole and quadrupole collective excitations of a dilute ultra-cold Fermi gas with an attractive interatomic interaction. The system is treated fully microscopically within the Bogoliubov-de Gennes and quasiparticle random-phase approximation methods. The dependence on the temperature and on the trap frequency is analyzed and systematic comparisons with the corresponding hydrodynamic predictions are presented in order to study the limits of validity of the semiclassical approach.

9 pages, 4 figures

References in corpus (3)

• Observation of Bose-Einstein Condensation of Molecules
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover

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• Pairing correlations of cold fermionic gases at overflow from a narrow to a wide harmonic trap
• Superfluid fraction in the rod phase of the inner crust of neutron stars
• Coupled oscillator model of a trapped Fermi gas at the BEC-BCS crossover
• Small amplitude collective modes of a finite-size unitary Fermi gas in deformed traps