Few Versus Many-Body Physics of an Impurity Immersed in a Superfluid of Spin $1/2$ Attractive Fermions

Few Versus Many-Body Physics of an Impurity Immersed in a Superfluid of Spin $1 / 2$ Attractive Fermions

M. Pierce, X. Leyronas, and F. Chevy

Phys. Rev. Lett. 123, 080403 – Published 23 August 2019

Abstract

In this Letter we investigate the properties of an impurity immersed in a superfluid of strongly correlated spin $1 / 2$ fermions and 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 and that our approach naturally provides a unifying framework for Bose and Fermi polaron physics.

Received 11 March 2019
Revised 12 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.080403

Physics Subject Headings (PhySH)

Bose-Fermi mixtures Cold atoms & matter waves Fermi gases Fermionic condensates Mixtures of atomic and/or molecular quantum gases

Perturbation theory

General PhysicsAtomic, Molecular & OpticalStatistical Physics & Thermodynamics

Authors & Affiliations

M. Pierce¹, X. Leyronas², and F. Chevy¹

¹Laboratoire Kastler Brossel, ENS-Université PSL, CNRS, Sorbonne Université, Collège de France, 75005 Paris France
²Laboratoire de physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris-Diderot, Sorbonne Paris Cité, 75005 Paris France

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Issue

Vol. 123, Iss. 8 — 23 August 2019

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