title: Normal phase of an imbalanced Fermi gas.
abstract: Recent experiments on imbalanced Fermi gases have raised interest in the physics of an impurity immersed in a Fermi sea, the so-called Fermi polaron. In this Letter, a simple theory is devised to describe dilute Fermi-polaron ensembles corresponding to the normal phase of an imbalanced Fermi gas. An exact formula is obtained for the dominant interaction between polarons, expressed solely in terms of a single-polaron parameter. The physics of this interaction is identified as a signature of the Pauli exclusion principle.
authors.affiliation: Laboratoire Pierre-Aigrain, Ecole Normale Supérieure, CNRS and Université Paris 7 Diderot, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Mora
authors.forename: Frédéric
authors.initials: F
authors.lastname: Chevy