A fermionic impurity in a dipolar quantum droplet

TL;DR

This paper develops a theoretical framework to study how a small number of fermions interact with self-bound dipolar quantum droplets, revealing bound states and potential as probes for droplet properties.

Contribution

It introduces a new model for Bose-Fermi mixtures in dipolar quantum droplets, highlighting bound states and weak back-action of fermionic impurities.

Findings

Existence of attractive interaction potential with bound states

Fermions can occupy these bound states with minimal impact on bosons

Impurities can serve as probes for droplet properties

Abstract

In this article we develop the framework to describe Bose-Fermi mixtures of magnetic atoms, focusing on the interaction of bosonic self-bound dipolar quantum droplets with a small number of fermions. We find an attractive interaction potential due to the dipolar interaction with several bound states, which can be occupied by one fermion each, resulting in a very weak back-action on the bosons. We conclude, that these impurities might act as unique probes giving access to inherent properties of dipolar quantum droplets.