Superfluid-density of the ultra-cold Fermi gas in optical lattices

Details Superfluid-density of the ultra-cold Fermi gas in optical lattices Superfluid-density of the ultra-cold Fermi gas in optical lattices

2008-11-21

arxiv.org/abs/0811.3623v3

J. Phys. B: At. Mol. Opt. Phys. 42 (2009) 165304

Physics

Condensed Matter

Other Condensed Matter

21 pages, 9 figures

Scientific paper

In this paper we study the superfluid density of the two component Fermi gas in optical lattices with population imbalance. Three different type of phases, the BCS-state (Bardeen, Cooper, and Schrieffer), the FFLO-state (Fulde, Ferrel, Larkin, and Ovchinnikov), and the Sarma state, are considered. We show that the FFLO superfluid density differs from the BCS/Sarma superfluid density in an important way. Although there are dynamical instabilities in the FFLO phase, when the interaction is strong or densities are high, on the weak coupling limit the FFLO phase is found to be stable.

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