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

Abstract

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.

e.g.:4 pages, 3 figures

References in corpus (3)

• Two-species fermion mixtures with population imbalance
• Spin-1/2 fermions on spin-dependent optical lattices
• Superfluid shells for trapped fermions with mass and population imbalance

Cited by in corpus (11)

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• Interplay of mass imbalance and frustration in correlated band insulators