Mixtures of dipolar gases in two dimensions: a quantum Monte Carlo study

TL;DR

This study uses quantum Monte Carlo simulations to analyze the miscibility of two dipolar Bose gases in two dimensions, revealing a narrow parameter regime where they can coexist and introducing a predictive parameter.

Contribution

First application of diffusion Monte Carlo to two-dimensional dipolar Bose mixtures, identifying conditions for miscibility and proposing a predictive adimensional parameter.

Findings

Miscibility is limited by dipolar moments and masses.

A narrow regime allows for stable mixing.

An adimensional parameter accurately predicts miscibility.

Abstract

We studied the miscibility of two dipolar quantum gases in the limit of zero temperature. The system under study is composed by a mixture of two Bose gases with dominant dipolar interaction in a two-dimensional harmonic confinement. The dipolar moments are considered all to be perpendicular to the plane, turning the dipolar potential in a purely repulsive and isotropic model. Our analysis is carried out by using the diffusion Monte Carlo method which allows for an exact solution to the many-body problem within some statistical noise. Our results show that the miscibility between the two species is rather constrained as a function of the relative dipolar moments and masses of the two components. A narrow regime is predicted where both species mix and we introduce an adimensional parameter whose value predicts quite accurately the miscibility of the two dipolar gases.