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

Abstract

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.

Contents revised. Added references

References in corpus (7)

• Finite temperature phase diagram of a polarised Fermi condensate
• Induced P-wave Superfluidity in Asymmetric Fermi Gases
• Sarma Phase in Trapped Unbalanced Fermi Gases
• Stability conditions and phase diagrams for two component Fermi gases with population imbalance
• Nonzero orbital angular momentum superfluidity in ultracold Fermi gases
• Comment on "Superfluid stability in the BEC-BCS crossover"
• Homogeneous Fermion Superfluid with Unequal Spin Populations

Cited by in corpus (5)

• p-wave Pairing in Two-Component Fermi System with Unequal Population: Weak Coupling BCS to Strong Coupling BEC Regimes
• P-wave Pairing in Two-Component Fermi Systems with Unequal Population near Feshbach Resonance
• Induced superfluidity of imbalanced Fermi gases near unitarity
• Mediated Interactions and Damping Effects in Superfluid Mixtures of Bose and Fermi Gases
• Signatures of Fermion Pairing with Unconventional Symmetry around BCS-BEC Crossover in a Quasi-2D Lattice