Quantum Phases of Self-Bound Droplets of Bose-Bose Mixtures

TL;DR

This paper explores the quantum phases of self-bound Bose-Bose mixture droplets in two dimensions, revealing three distinct phases and providing phase diagrams and experimental signatures for their identification.

Contribution

It introduces a systematic analysis of the quantum phases of binary Bose gas droplets using Gaussian state theory, including phase boundaries and stabilization mechanisms.

Findings

Identification of two squeezed and one coherent phase

Phase diagram mapping and boundary determination

Radial size measurement as an experimental signature

Abstract

We systematically investigate the ground-state properties of self-bound droplets of quasi-two-dimensional binary Bose gases by using the Gaussian state theory. We find that quantum droplets consists two macroscopic squeezed phases and a macroscopic coherent phase. We map out the phase diagram and determine all phase boundaries via both numerical and nearly analytical methods. In particular, we find three easily accessible signatures for the quantum phases and the stablization mechanism of the self-bound droplets by precisely measuring their radial size. Our studies indicate that binary droplets represent an ideal platform for in-depth investigations of the quantum nature of the droplet state.