The third virial coefficient of a two-component unitary Fermi gas across an Efimov-effect threshold
Résumé
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 $\alpha$ across $\alpha_c\simeq 13.6069$ 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 $\alpha$ across $\alpha_c$ since, unexpectedly, the three-body parameter characterizing the interaction
is relevant even on the non-Efimovian side $\alpha<\alpha_c$.
Domaines
Gaz Quantiques [cond-mat.quant-gas]Origine | Fichiers produits par l'(les) auteur(s) |
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