Phase Diagram of Two-dimensional Polarized Fermi Gas With Spin-Orbit Coupling

TL;DR

This paper explores the phase diagram of a two-dimensional polarized Fermi gas with spin-orbit coupling, revealing phase separation, topological phases, and the effects of binding energy and spin-orbit interaction on superfluidity.

Contribution

It provides a detailed analysis of the ground state phases and phase separation phenomena in 2D polarized Fermi gases with spin-orbit coupling at zero temperature.

Findings

Phase separation occurs at low binding energy.

Topological and trivial superfluid phases coexist at higher binding energies.

Spin-orbit coupling enhances triplet pairing and suppresses phase separation.

Abstract

We investigate the ground state of the two-dimensional polarized Fermi gas with spin-orbit coupling and construct the phase diagram at zero temperature. We find there exist phase separation when the binding energy is low. As the binding energy increasing, the topological nontrivial superfluid phase coexist with topologically trivial superfluid phase which is topological phase separation. The spin-orbit coupling interaction enhance the triplet pairing and destabilize the phase separation against superfluid phase.