Ground state and rotational properties of two-dimensional self-bound quantum droplets

TL;DR

This paper investigates the ground state and rotational behavior of two-dimensional self-bound quantum droplets made of Bose-Einstein condensates, revealing various phases and vortex phenomena relevant to superfluid studies.

Contribution

It introduces a detailed analysis of rotational responses and phase behavior in 2D quantum droplets, highlighting their potential for superfluid research.

Findings

Identification of multiple phases depending on system parameters

Observation of vortex formations including ghost and quantized vortices

Analysis of the system's response to external harmonic confinement

Abstract

We consider a two-dimensional self-bound quantum droplet, which consists of a mixture of two Bose-Einstein condensates. We start with the ground state, and then turn to the rotational response of this system, in the presence of an external (harmonic) potential. We identify various phases, depending on the atom number, the strength of the external confinement and the angular momentum. These include center of mass excitation, ghost vortices, as well as vortices of single and multiple quantization. According to our results, this is an excellent system for the study of superfluid states.