Intermediate-temperature superfluidity in an atomic Fermi gas with population imbalance

We derive the underlying finite temperature theory which describes Fermi gas superfluidity with population imbalance in a homogeneous system. We compute the pair formation temperature, superfluid transition temperature T-c, and superfluid density in a manner consistent with the standard ground state equations and, thereby, present a complete phase diagram. Finite temperature stabilizes superfluidity, as manifested by two solutions for T-c or by low T instabilities. At unitarity, the polarized state is an intermediate-temperature superfluid.