Asymmetric Fermion Superfluid with Inter- and Intra-Species Pairings

TL;DR

This paper explores the phase structure of asymmetric fermion superfluids, revealing how intra-species pairing alters the phase diagram and leads to a new fully gapped state with coexisting pairings.

Contribution

It introduces intra-species pairing into the analysis of asymmetric fermion superfluids, significantly changing the phase diagram and identifying a new coexisting pairing state.

Findings

Intra-species pairing modifies the phase diagram.

A new coexisting pairing state is identified.

All fermion excitations are fully gapped in the intra-species pairing region.

Abstract

We investigate the phase structure of an asymmetric fermion superfluid with inter- and intra-species pairings. The introduction of the intra-species pairing mechanism in canonical ensemble changes significantly the phase diagram and brings in a new state with coexisting inter- and intra-species pairings. Different from the case with only inter-species pairing, all the fermion excitations are fully gapped in the region with intra-species pairing.