Quantum de-mixing in binary mixtures of dipolar bosons

TL;DR

This study uses Quantum Monte Carlo simulations to demonstrate quantum-induced de-mixing in binary dipolar boson mixtures, highlighting the role of quantum statistics and exchanges in phase separation at low temperatures.

Contribution

It provides the first numerical evidence that quantum statistics can cause de-mixing in dipolar boson mixtures, emphasizing the importance of particle exchanges.

Findings

De-mixing occurs at low temperatures due to quantum statistics.

Long particle exchanges facilitate spatial separation.

Higher temperatures lead to miscibility due to entropy.

Abstract

Quantum Monte Carlo simulations of a two-component Bose mixture of trapped dipolar atoms of identical masses and dipole moments, provide numerical evidence of de-mixing at low finite temperatures. De-mixing occurs as a consequence of quantum statistics, which results in an effective attraction between like bosons. Spatial separation of two components takes place at low temperature with the onset of long exchanges of identical particles, underlying Bose-Einstein condensation of both components. Conversely, at higher temperature the system is miscible due to the entropy of mixing. Exchanges are also found to enhance de-mixing in the case of mixtures of non-identical and distinguishable species.