Phase separation and collapse in Bose-Fermi mixtures with a Feshbach resonance

Francesca M. Marchetti, Charles J.M. Mathy, David A. Huse, Meera M. Parish

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We consider a mixture of single-component bosonic and fermionic atoms with an interspecies interaction that is varied using a Feshbach resonance. By performing a mean-field analysis of a two-channel model, which describes both narrow and broad Feshbach resonances, we find an unexpectedly rich phase diagram at zero temperature: Bose-condensed and non-Bose-condensed phases form a variety of phase-separated states that are accompanied by both critical and tricritical points. We discuss the implications of our results for the experimentally observed collapse of Bose-Fermi mixtures on the attractive side of the Feshbach resonance, and we make predictions for future experiments on Bose-Fermi mixtures close to a Feshbach resonance.

Original languageEnglish
Article number134517
JournalPhysical Review B
Issue number13
Publication statusPublished - 14 Oct 2008
Externally publishedYes

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