Mixtures of Dipolar Gases in Two Dimensions: A Quantum Monte Carlo Study

Abstract

We studied the miscibility of two dipolar quantum gases in the limit of zero temperature. The system under study is composed of a mixture of two Bose gases with dominant dipolar interaction in a two-dimensional harmonic confinement. The dipolar moments are all considered 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 quite accurately predicts the miscibility of the two dipolar gases.

Stability of a flattened dipolar binary condensate: emergence of the spin roton

“…The interplay of immiscibility and the long-ranged interactions has been the subject of investigations exploring pattern formation and novel instabilities [14,15]. Also, a number of studies have considered properties of the condensate ground states in stationary [16] and in rotating frames [17][18][19][20] (also see [21]).…”