Self-Bound Quantum Droplet with Internal Stripe Structure in 1D Spin-Orbit-Coupled Bose Gas

TL;DR

This paper investigates a 3D spin-orbit-coupled Bose gas, revealing a self-bound quantum droplet with an internal stripe structure, tunable by coupling strengths, expanding understanding of quantum phases in such systems.

Contribution

It introduces a detailed numerical analysis of quantum droplets with stripe phases in 3D spin-orbit-coupled Bose gases, highlighting their stability and tunability.

Findings

Stripe phase exists over a wider Raman coupling range than BEC-gas state

Droplet density can be tuned via spin-orbit and Raman coupling strengths

Stripe structure persists within the quantum droplet state

Abstract

We study the quantum-droplet state in a 3-dimensional (3D) Bose gas in the presence of 1D spin-orbit-coupling and Raman coupling, especially the stripe phase with density modulation, by numerically computing the ground state energy including the mean-field energy and Lee-HuangYang correction. In this droplet state, the stripe can exist in a wider range of Raman coupling, compared with the BEC-gas state. More intriguingly, both spin-orbit-coupling and Raman coupling strengths can be used to tune the droplet density.