title: Spin 1/2 fermions in the unitary regime: a superfluid of a new type.
abstract: We study, in a fully nonperturbative calculation, a dilute system of spin 1/2 interacting fermions, characterized by an infinite scattering length at finite temperatures. Various thermodynamic properties and the condensate fraction are calculated and we also determine the critical temperature for the superfluid-normal phase transition in this regime. The thermodynamic behavior appears as a rather surprising and unexpected mélange of fermionic and bosonic features. The thermal response of a spin 1/2 fermion at the BCS-BEC crossover should be classified as that of a new type of superfluid.
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.
authors.forename: Aurel
authors.initials: A
authors.lastname: Bulgac
authors.forename: Joaquín E
authors.initials: JE
authors.lastname: Drut
authors.forename: Piotr
authors.initials: P
authors.lastname: Magierski