Rotating Fulde-Ferrell-Larkin-Ovchinnikov state in cold Fermi gases

TL;DR

This paper explores how rotation influences the FFLO superfluid states in cold Fermi gases, revealing new vortex and mixed phases, and mapping their stability and characteristics in phase diagrams.

Contribution

It introduces two novel FFLO phases stabilized by rotation and provides detailed phase diagrams and properties of these states in cold Fermi gases.

Findings

Identification of half quantum vortex and intermediate FF-LO states

Stability regions of various FFLO phases mapped in phase diagrams

Characteristic features like order parameter and flux quantization analyzed

Abstract

We study an effect of rotation on the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state of two component Fermi superfluid gases in a toroidal trap. We investigate a stability of the FFLO states in the quasi-one-dimensional regime on the basis of the Bogoliubov-de Gennes equation. We find that two novel FFLO phases, i.e., the half quantum vortex state and the intermediate state of Fulde-Ferrell (FF) state and Larkin-Ovchinnikov (LO) state, are stabilized by the rotation. The phase diagram for the FF state, LO state, intermediate state, and half quantum vortex state is shown in both T-P plane and T-h plane. We demonstrate characteristic features of these states, such as the order parameter, flux quantization, and local polarization. Several related works are discussed, and the advantages of cold Fermi gases are indicated.