Fulde-Ferrell superfluids in an asymmetric three-component Fermi Gas

TL;DR

This paper explores Fulde-Ferrell superfluids in an asymmetric three-component Fermi gas with spin-orbit coupling and population imbalance, revealing a new class of composite superfluids due to strong spin-orbit effects.

Contribution

It introduces a novel class of composite Fulde-Ferrell superfluids arising from strong spin-orbit coupling in an asymmetric three-component Fermi gas.

Findings

Identification of a double-well structure in momentum space caused by spin-orbit coupling.

Discovery of a new class of composite Fulde-Ferrell superfluids.

Analysis of thermodynamic potential minima to characterize superfluid phases.

Abstract

An asymmetric three-component Fermi gas, featuring Raman-induced spin-orbit coupling between the first and second components and contact interaction only between the first and third components, introduces both spin-orbit coupling and population imbalance-two mechanisms known to stabilize the Fulde-Ferrell superfluids.We systematically study Fulde-Ferrell superfluids in an asymmetric three-component Fermi gas by finding the global minima of the thermodynamic potential. We reveal a new class of composite Fulde-Ferrell superfluids that emerges when strong spin-orbit coupling generates a double-well structure in momentum space within the lower spin-orbit-coupled band. The key features of these composite superfluids are identified.