Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species Correlations

Details Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species Correlations Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species Correlations

2006-11-16

arxiv.org/abs/cond-mat/0611421v2

Physics

Condensed Matter

Superconductivity

Contents revised. Added references

Scientific paper

10.1103/PhysRevB.76.212502

We consider inter- and intra-species pairing interactions in an asymmetrical Fermi system. Using 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. Due to intra-species correlations, the BCS singlet superfluid state can sustain finite polarizations, $P$. For larger $P$, we find phase separations in BCS and BEC regimes. A superfluid phase exists for all $P$ deep in BEC regime. Our results may apply to pairing in ultracold fermions, nuclear and quark matter physics.

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