Thermally induced local imbalance in repulsive binary Bose mixtures

Year: 2023

Authors: Pascual G., Spada G., Pilati S., Giorgini S., Boronat J.

Autors Affiliation: Univ Politecn Cataluna, Dept Fis, Campus Nord B4-B5, E-08034 Barcelona, Spain; Pitaevskii BEC Ctr, Dipartimento Fis, I-38123 Trento, Italy; Univ Trento, CNR INO, I-38123 Trento, Italy; Univ Camerino, Sch Sci & Technol, Phys Div, I-62032 Camerino, Italy; INFN, Sez Perugia, I-06123 Perugia, Italy.

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.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 5 (3)      Pages from: L032041-1  to: L032041-6

More Information: This work has been supported by the Spanish Ministry of Universities under FPU Grant No.FPU20/00013 and the Spanish Ministry of Economics, Industry and Competitiveness under Grant No. PID2020-113565GB-C21. G.S., S.G., and S.P. acknowledge the Italian Ministry of University and Research under the PRIN2017 project CEnTraL (Protocol No. 20172H2SC4).S.P. also acknowledges support from PNRR MUR Project No. PE0000023-NQSTI and from PRACE, for awarding access to the Fenix Infrastructure resources at Cineca, which are partially funded from the European Union Horizon 2020 research and innovation program through the ICEI project under Grant Agreement No. 800858. S.G. acknowledges also cofunding by European Union NextGenerationEU. Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them.r access to the Fenix Infrastructure resources at Cineca, which are partially funded from the European Union Horizon 2020 research and innovation program through the ICEI project under Grant Agreement No. 800858. S.G. acknowledges also cofunding by European Union NextGenerationEU. Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them.
KeyWords: Ground-state
DOI: 10.1103/PhysRevResearch.5.L032041

Citations: 1
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