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arXiv · 2401.03926

Temperature-induced miscibility of impurities in trapped Bose gases

G. Pascual·T. Wasak·A. Negretti·G. E. Astrakharchik·J. Boronat
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Abstract

We study the thermal properties of impurities embedded in a repulsive Bose gas under a harmonic trapping potential. In order to obtain exact structural properties in this inhomogeneous many-body system, we resort to the path-integral Monte Carlo method. We find that, at low temperatures, a single impurity is expelled to the edges of the bath cloud if the impurity-boson coupling constant is larger than the boson-boson one. However, when the temperature is increased, but still in the Bose-condensed phase, the impurity occupies the core of the trap and, thus, the system becomes miscible. This thermal-induced miscibility transition is also observed for a finite concentration of impurities in this inhomogeneous system. We find that the transition temperature for miscibility depends on the impurity-boson interaction and we indicate a novel nondestructive method to measure the temperature of a system based on the studied phenomenon.

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G. Pascual, T. Wasak, A. Negretti, G. E. Astrakharchik, J. Boronat. 2024-01-08. Temperature-induced miscibility of impurities in trapped Bose gases. https://doi.org/10.1103/physrevresearch.6.l022014

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