Equilibrium and dynamics of a trapped superfluid Fermi gas with unequal masses

Details Equilibrium and dynamics of a trapped superfluid Fermi gas with unequal masses Equilibrium and dynamics of a trapped superfluid Fermi gas with unequal masses

2007-09-11

arxiv.org/abs/0709.1690v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevA.77.033611

Interacting Fermi gases with equal populations but unequal masses are investigated at zero temperature using local density approximation and the hydrodynamic theory of superfluids in the presence of harmonic trapping. We derive the conditions of energetic stability of the superfluid configuration with respect to phase separation and the frequencies of the collective oscillations in terms of the mass ratio and the trapping frequencies of the two components. We discuss the behavior of the gas after the trapping potential of a single component is switched off and show that, near a Feshbach resonance, the released component can still remain trapped due to many-body interaction effects. Explicit predictions are presented for a mixture of $^6$Li and $^{40}$K with resonant interaction.

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