Fate of an impurity strongly interacting with a thermal Bose gas

• URL: http://arxiv.org/abs/2508.06493v1
• Date: Fri, 08 Aug 2025 17:59:50 GMT
• Title: Fate of an impurity strongly interacting with a thermal Bose gas
• Abstract summary: We study mobile impurities immersed in a homogeneous bosonic bath (a box-trapped Bose gas)<n>For strong impurity-bath interactions, the spectra narrow with increasing temperature, while the impurity energy shift is suppressed.<n>Near the critical temperature for condensation, many-body effects still play an important role, and only for a nondegenerate bath, the system approaches the classical Boltzmann-gas behavior.
• Score: 0.14043931310479374
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We spectroscopically study mobile impurities immersed in a homogeneous bosonic bath (a box-trapped Bose gas), varying the bath temperature and the strength of impurity-bath interactions. We compare our results to those for a quasipure Bose-Einstein condensate (BEC), and find that for strong impurity-bath interactions, the spectra narrow with increasing temperature, while the impurity energy shift is suppressed. Near the critical temperature for condensation, many-body effects still play an important role, and only for a nondegenerate bath, the system approaches the classical Boltzmann-gas behavior. The key spectral features are reproduced within the theory of an ideal Bose polaron.

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