Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices

Details Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices

2007-04-20

arxiv.org/abs/0704.2660v1

Phys. Rev. B 76, 104517 (2007)

Physics

Condensed Matter

Superconductivity

e.g.:4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.104517

We study the effect of mass imbalance on the phase diagram of a two-component fermionic mixture with attractive interactions in optical lattices. Using static and dynamical mean-field theories, we show that the pure superfluid phase is stable for all couplings when the mass imbalance is smaller than a limiting value. For larger imbalance, phase separation between a superfluid and a charge-density wave takes place when the coupling exceeds a critical strength. The harmonic trap induces a spatial segregation of the two phases, with a rapid variation of the density at the boundary.

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