Speed of sound in a superfluid Fermi gas in an optical lattice

Details Speed of sound in a superfluid Fermi gas in an optical lattice Speed of sound in a superfluid Fermi gas in an optical lattice

2010-06-07

arxiv.org/abs/1006.1392v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

A system of equal mixture of $^6Li$ atomic Fermi gas of two hyperfine states loaded into a cubic three-dimensional optical lattice is studied assuming a negative scattering length (BCS side of the Feshbach resonance). When the interaction is attractive, fermionic atoms can pair and form a superfluid. The dispersion of the phonon-like mode and the speed of sound in the long-wavelength limit are obtained by solving the Bethe-Salpeter equations for the collective modes of the attractive Hubbard Hamiltonian.

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