Pairing in asymmetrical Fermi systems with intra- and interspecies correlations

[摘要] We explore ground states of asymmetrical Fermi systems where both inter- (g(o)) and intra- (g(1)) species pairing interactions are present. Using the equation of motion method, we obtain coupled mean-field equations for superfluid gap functions and population densities. We construct a phase diagram across BCS-BEC regimes. At low polarizations P, we find stable superfluid phases on BCS and BCS sides of unitarity for g(1)> g(1)(c), a critical value, for a given g(o). For larger P, we find phase separations in both regimes. A superfluid phase exists for all polarizations deep in the BEC regime. Our results should apply to a broad range of Fermi systems.

[发布日期] 2007-12-01

[关键词] SUPERCONDUCTIVITY