Quantum de-mixing in binary mixtures of dipolar bosons

摘要

Quantum Monte Carlo simulations of a two-component Bose mixture of trappeddipolar atoms of identical masses and dipole moments, provide numericalevidence of de-mixing at low finite temperatures. De-mixing occurs as aconsequence of quantum statistics, which results in an effective attractionbetween like bosons. Spatial separation of two components takes place at lowtemperature with the onset of long exchanges of identical particles, underlyingBose-Einstein condensation of both components. Conversely, at highertemperature the system is miscible due to the entropy of mixing. Exchanges arealso found to enhance de-mixing in the case of mixtures of non-identical anddistinguishable species.