title: Attractive Fermi gases with unequal spin populations in highly elongated traps.
abstract: We investigate two-component attractive Fermi gases with imbalanced spin populations in trapped one-dimensional configurations. The ground state properties are determined with the local density approximation, starting from the exact Bethe-ansatz equations for the homogeneous case. We predict that the atoms are distributed according to a two-shell structure: a partially polarized phase in the center of the trap and either a fully paired or a fully polarized phase in the wings. The partially polarized core is expected to be a superfluid of the Fulde-Ferrell-Larkin-Ovchinnikov type. The size of the cloud as well as the critical spin polarization needed to suppress the fully paired shell are calculated as a function of the coupling strength.
authors.affiliation: BEC-INFM and Dipartimento di Fisica, Universitá di Trento, 1-38050 Povo, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Orso