Few vs many-body physics of an impurity immersed in a superfluid of spin 1/2 attractive fermions - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2019

Few vs many-body physics of an impurity immersed in a superfluid of spin 1/2 attractive fermions

Résumé

In this article we investigate the properties of an impurity immersed in a superfluid of strongly correlated spin 1/2 fermions. For resonant interactions, we first relate the stability diagram of dimer and trimer states to the three-body problem for an impurity interacting with a pair of fermions. Then we calculate the beyond-mean-field corrections to the energy of a weakly interacting impurity. We show that these corrections are divergent and have to be regularized by properly accounting for three-body physics in the problem.
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Dates et versions

hal-02053062 , version 1 (01-03-2019)
hal-02053062 , version 2 (12-06-2019)

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Matthieu Pierce, Xavier Leyronas, Frédéric Chevy. Few vs many-body physics of an impurity immersed in a superfluid of spin 1/2 attractive fermions. 2019. ⟨hal-02053062v1⟩
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