Fermi-Bose Mixtures Near Broad Interspecies Feshbach Resonances

TL;DR

This paper investigates the behavior of Fermi-Bose mixtures near broad interspecies Feshbach resonances, revealing a first order phase transition and analyzing many-body correlations and pairing mechanisms.

Contribution

It introduces the concept of a first order phase transition between different pairing states in Fermi-Bose mixtures near broad resonances.

Findings

Evidence for a first order phase transition

Identification of a fully paired mixture with extended fermionic molecules

Analysis of Fermi surface dynamics and pair fluctuations

Abstract

In this Letter we have studied dressed bound states in Fermi-Bose mixtures near broad interspecies resonance, and implications on many-body correlations. We present the evidence for a first order phase transition between a mixture of Fermi gas and condensate, and a fully paired mixture where extended fermionic molecules occupy a single pairing channel instead of forming a molecular Fermi surface. We have further investigated the effect of Fermi surface dynamics, pair fluctuations and discussed the validity of our results.