Fulde-Ferrell Pairing instability in Spin-Orbit Coupled Fermi Gas

TL;DR

This paper investigates the emergence of Fulde-Ferrell superfluid phases in spin-orbit coupled ultracold Fermi gases under Zeeman fields, revealing their dominance in the phase diagram through theoretical calculations.

Contribution

It introduces the Fulde-Ferrell pairing instability as a dominant phase in spin-orbit coupled Fermi gases, supported by two-body and mean-field many-body analyses.

Findings

Fulde-Ferrell superfluid dominates the phase diagram

The phase persists at zero and finite temperatures

Systematic analysis of the phase's origin and properties

Abstract

We consider finite-momentum pairing of superfluid phase in ultracold Fermi gas with spin-orbit coupling when subjected to an effective Zeeman field. Based on our two body and mean field many body calculations, we show that the Fulde-Ferrell type superfluid dominates in zero and finite temperature phase diagram. We examine the origin and properties of this novel phase systematically.