Topological Phase Separation In Trapped Ultracold Fermionic Gases

TL;DR

This paper studies how topological superfluid phases emerge and coexist with normal phases in trapped 2D ultracold fermionic gases with spin-orbit coupling and superfluidity, depending on the Zeeman field strength.

Contribution

It reveals the critical Zeeman field value for topological phase separation in harmonically trapped 2D fermionic gases with spin-orbit coupling.

Findings

Topological superfluid phases appear when Zeeman field exceeds a critical value.

Topological phase separation occurs in the trapped region.

Superfluid phase is trivial below the critical Zeeman field.

Abstract

We investigate the harmonically trapped 2D fermionic systems with a effective spin-orbit coupling and intrinsic s-wave superfluidity under the local density approximation, and find that there is a critical value for Zeeman field. When the Zeeman field larger than the critical value, the topological superfluid phases emerge and coexist with the normal superfluid phase, topological phase separation, in the trapped region. Otherwise, the superfluid phase is topologically trivial.