The third virial coefficient of a two-component unitary Fermi gas across an Efimov-effect threshold

Chao Gao, Shimpei Endo, Yvan Castin

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Abstract

We consider a mixture of two single-spin-state fermions with an interaction of negligible range and infinite s-wave scattering length. By varying the mass ratio across one can switch on and off the Efimov effect. We determine analytically the third cluster coefficient of the gas. We show that it is a smooth function of across since, unexpectedly, the three-body parameter characterizing the interaction is relevant even on the non-Efimovian side.
Original languageEnglish
Article number16003
Pages (from-to)1-6
Number of pages6
JournalEPL
Volume109
Issue number1
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

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