Impurity in a three-dimensional unitary Bose gas

TL;DR

This paper investigates the properties of a single impurity in a three-dimensional Bose gas at the unitary limit, providing initial estimates for key quasiparticle parameters using a mean-field approximation.

Contribution

It introduces the first estimations of impurity spectrum parameters in a unitary Bose gas using a simple mean-field-like approach.

Findings

Estimated binding energy for impurity spectrum.

Calculated effective mass of the impurity.

Determined quasiparticle residue for Bose polarons.

Abstract

By using simple and efficient method we discuss properties of a single impurity immersed in three-dimensional Bose gas with the interaction between particles tuned to unitary limit. Particularly, adopting the mean-field-like approximation we present the first estimations for the low-momentum parameters of the impurity spectrum, namely, the binding energy, the effective mass and the quasiparticle residue both for repulsive and attractive Bose polarons in the unitary gas.