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arXiv · 2311.14313

Exact results for heavy unitary Bose polarons

Nikolay Yegovtsev·Grigori E. Astrakharchik·Pietro Massignan·Victor Gurarie
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Abstract

We consider the problem of unitary Bose polarons, i.e., impurities interacting via a potential with infinite scattering length with a bath of weakly interacting bosons. We provide an analytic expression for the energy of a heavy impurity whose interaction potential has a range larger than the healing length of the bath. Furthermore, we perform numerically exact Diffusion Monte Carlo calculations and we demonstrate that the simple Gross-Pitaevskii theory provides a remarkably accurate description of heavy unitary Bose polarons throughout the whole experimentally relevant range of gas densities.

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Nikolay Yegovtsev, Grigori E. Astrakharchik, Pietro Massignan, Victor Gurarie. 2023-11-24. Exact results for heavy unitary Bose polarons. https://doi.org/10.1103/physreva.110.023310

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