Sound propagation and oscillations of a superfluid Fermi gas in the presence of a 1D optical lattice

Details Sound propagation and oscillations of a superfluid Fermi gas in the presence of a 1D optical lattice Sound propagation and oscillations of a superfluid Fermi gas in the presence of a 1D optical lattice

2004-07-20

arxiv.org/abs/cond-mat/0407532v2

Physics

Condensed Matter

Soft Condensed Matter

Version accepted in Phys. Rev. A. It contains a discussion on the dynamical instability of Fermi superfluids in optical lattic

Scientific paper

10.1103/PhysRevA.71.053602

We develop the hydrodynamic theory of Fermi superfluids in the presence of a periodic potential. The relevant parameters governing the propagation of sound (compressibility and effective mass) are calculated in the weakly interacting BCS limit. The conditions of stability of the superfluid motion with respect to creation of elementary excitations are discussed. We also evaluate the frequency of the center of mass oscillation when the superfluid gas is additionally confined by a harmonic trap.

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