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  • Letter
  • Open Access

Temperature-induced miscibility of impurities in trapped Bose gases

G. Pascual1, T. Wasak2, A. Negretti3, G. E. Astrakharchik1, and J. Boronat1

  • 1Departament de Física, Universitat Politècnica de Catalunya, Campus Nord B4-B5, E-08034 Barcelona, Spain
  • 2Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziądzka 5, PL-87-100 Toruń, Poland
  • 3Zentrum für Optische Quantentechnologien, Fachbereich Physik, Luruper Chaussee 149, D-22761 Hamburg, Germany

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Phys. Rev. Research 6, L022014 – Published 16 April, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L022014

Abstract

We study the thermal properties of impurities embedded in a repulsive Bose gas under a harmonic trapping potential. In order to obtain the 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 center of the trap and, thus, the system becomes miscible. This thermal-induced miscibility crossover 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 different nondestructive method to measure the temperature of a system based on the studied phenomenon.

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Phys. Rev. Research 6, L022014– Published 16 April, 2024
  • Received 22 December 2023
  • Accepted 14 March 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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