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One, Two, Three, Many: the lifetime of an ultracold Bose-Fermi mixture

Event Details

Event Dates: 

Thursday, April 20, 2017 - 2:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Christophe Salomon

Speaker Affiliation(s): 

Ecole Normale Superieure
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Public Seminar

Event Details & Abstract: 

We study three-body recombination in an ultracold Bose-Fermi mixture. We first show theoretically that, for weak interspecies coupling, the loss rate is proportional to Tan’s contact. Second, using a 7Li/6Li mixture we probe the recombination rate in both the thermal and dual superfluid regimes. We find excellent agreement with our model in the BEC-BCS crossover. At unitarity where the fermion-fermion scattering length diverges, we show that the loss rate is proportional to nf4/3 where nf  is the Fermi gas density.

This unusual exponent signals nontrivial two-body correlations in the system.

Our results demonstrate that few-body losses can be used as a quantitative probe of quantum correlations in many-body ensembles [1].

[1] Sébastien Laurent, Matthieu Pierce, Marion Delehaye, Tarik Yefsah, Frédéric Chevy, and Christophe Salomon, Phys. Rev. Lett., 118, 103403 (2017)