Orateur
Description
We study the lifetime of a mixture of quantum degenerate fermions and bosons [1]. We show that when the interspecies coupling is weak, the loss rate is proportional to Tan's Contact parameter. When the fermion-fermion interactions are varied from weakly to strongly attractive, our prediction interpolates between three-body (2 free fermions+ 1 boson) to two-body (bound fermion molecule + boson) losses. At the unitary limit when the fermion-fermion scattering length is infinite, we predict a fractional loss-rate proportional to n 4/3 where n is the density of fermions. We confirm our analysis by measuring the lifetime of a 6 Li/ 7 Li dual superfluid mixture in the BEC-BCS crossover.
[1] S. Laurent, M. Pierce, M. Delehaye, T. Yefsah, F. Chevy, C. Salomon, Phys. Rev. Lett., 118, 103403 (2017)
