Band-edge superfluid of Bose-Einstein condensates in the spin-orbit-coupled Zeeman lattice

TL;DR

This paper investigates the ground-state phase diagram of spin-orbit-coupled Bose-Einstein condensates in a Zeeman lattice, revealing an exotic band-edge superfluid phase with broad parameter stability.

Contribution

It provides a systematic analysis of the phase diagram, highlighting the existence and properties of the novel band-edge superfluid phase in these systems.

Findings

The band-edge phase is exotic and stable over a broad parameter range.

Superfluidity is confirmed through elementary excitations and superfluid fraction analysis.

The study advances understanding of superfluid phases in spin-orbit-coupled BECs.

Abstract

Since the first experimental realization of Bose-Einstein condensates in a spin-orbit-coupled Zeeman lattice, a wide range of applications have been found in these systems. Here, we systematically study the ground-state phase diagram of the systems. We address that the band-edge phase in the ground-state phase diagram is exotic and exists in a very broad parameter regime. The superfluidity of the band-edge states is identified by elementary excitations and superfluid fraction.