Ground state properties of interacting Bose polarons

TL;DR

This paper provides a theoretical analysis of how multiple impurity atoms influence the ground state properties of Bose polarons, extending existing models to include many-body effects and comparing with recent experiments.

Contribution

It introduces an extended many-body formalism for multiple Bose polarons that accounts for impurity interactions beyond the Fröhlich approximation.

Findings

Calculated polaron energy and effective mass for different impurity types.

Revealed the importance of the static structure factor in impurity interactions.

Compared theoretical results with recent experimental data.

Abstract

We theoretically investigate the role of multiple impurity atoms on the ground state properties of Bose polarons. The Bogoliubov approximation is applied for the description of the condensate resulting in a Hamiltonian containing terms beyond the Fr\"ohlich approximation. The many-body nature of the impurity atoms is taken into account by extending the many-body description for multiple Fr\"ohlich polarons, revealing the static structure factor of the impurities as the key quantity. Within this formalism various experimentally accessible polaronic properties are calculated such as the energy and the effective mass. These results are examined for system parameters corresponding to two recent experimental realizations of the Bose polaron, one with fermionic impurities and one with bosonic impurities.