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arXiv · 2302.13659

Thermal-induced Local Imbalance in Repulsive Binary Bose Mixtures

Gerard Pascual·Gabriele Spada·Sebastiano Pilati·Stefano Giorgini·Jordi Boronat
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Abstract

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 not reported before.

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Gerard Pascual, Gabriele Spada, Sebastiano Pilati, Stefano Giorgini, Jordi Boronat. 2023-02-27. Thermal-induced Local Imbalance in Repulsive Binary Bose Mixtures. https://doi.org/10.1103/physrevresearch.5.l032041

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