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Article Dans Une Revue Physical Review Letters Année : 2017

Connecting Few-Body Inelastic Decay to Quantum Correlations in a Many-Body System: A Weakly Coupled Impurity in a Resonant Fermi Gas

Résumé

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 fermionic 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.

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Autre

Dates et versions

hal-02392627 , version 1 (04-12-2019)

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Citer

Sébastien Laurent, Mathieu Pierce, Marion Delehaye, Tarik Yefsah, Frédéric Chevy, et al.. Connecting Few-Body Inelastic Decay to Quantum Correlations in a Many-Body System: A Weakly Coupled Impurity in a Resonant Fermi Gas. Physical Review Letters, 2017, 118 (10), pp.103403. ⟨10.1103/PhysRevLett.118.103403⟩. ⟨hal-02392627⟩
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