Superfluidity near phase separation in Bose-Fermi mixtures

TL;DR

This paper investigates how boson-fermion interactions influence superfluidity in mixed atomic gases, revealing that phonon damping can significantly raise the superfluid transition temperature near phase separation.

Contribution

It introduces a nonperturbative approach to analyze fermion pairing and superfluidity in Bose-Fermi mixtures, accounting for dynamical screening and phonon damping effects.

Findings

Superfluid transition temperature can be substantially increased.

Bosonic spectrum is affected near phase separation.

Damping of phonons influences superfluid properties.

Abstract

We study the transition to fermion pair superfluidity in a mixture of interacting bosonic and fermionic atoms. The fermion interaction induced by the bosons and the dynamical screening of the condensate phonons due to fermions are included using the nonperturbative Hamiltonian flow equations. We determine the bosonic spectrum near the transition towards phase separation and find that the superfluid transition temperature may be increased substantially due to phonon damping.