Thermally induced local imbalance in repulsive binary Bose mixtures

We study repulsive two-component Bose mixtures with equal populations and confined in a finite-size box through path-integral Monte Carlo simulations. For different values of the s-wave scattering length of the interspecies potential, we calculate the local population imbalance in a region of fixed...

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Bibliographic Details
Published in:Physical review research 2023-09, Vol.5 (3), p.L032041, Article L032041
Main Authors: Pascual, G., Spada, G., Pilati, S., Giorgini, S., Boronat, J.
Format: Article
Language:English
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Summary:We study repulsive two-component Bose mixtures with equal populations and confined in a finite-size box through path-integral Monte Carlo simulations. For different values of the s-wave scattering length of the interspecies potential, we calculate the local population imbalance in a region of fixed volume inside the box at different temperatures. We find two different behaviors: For phase-separated states at T=0, thermal effects induce a diffusion process which reduces the local imbalance, whereas for miscible states at T=0, a maximum in the local population imbalance appears at a certain temperature, below the critical one. We show that this intriguing behavior is strongly related to the bunching effect associated with the Bose-Einstein statistics of the particles in the mixture and to an unexpected behavior of the cross pair distribution function.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.5.L032041