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  • Letter
  • Open Access

Thermally induced local imbalance in repulsive binary Bose mixtures

G. Pascual1, G. Spada2, S. Pilati3,4, S. Giorgini2, and J. Boronat1

  • 1Departament de Física, Universitat Politècnica de Catalunya, Campus Nord B4-B5, E-08034 Barcelona, Spain
  • 2Pitaevskii BEC Center, Dipartimento di Fisica and CNR-INO, Università di Trento, 38123 Povo, Trento, Italy
  • 3School of Science and Technology, Physics Division, Università di Camerino, 62032 Camerino, Italy
  • 4INFN-Sezione di Perugia, 06123 Perugia, Italy

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Phys. Rev. Research 5, L032041 – Published 20 September, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L032041

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.

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Phys. Rev. Research 5, L032041– Published 20 September, 2023
  • Received 3 March 2023
  • Accepted 26 July 2023
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