title: Simple mean-field theory for a zero-temperature fermionic gas at a Feshbach resonance.
abstract: We present a simple two-channel mean-field theory for a zero-temperature two-component Fermi gas in the neighborhood of a Feshbach resonance. Our results agree with recent experiments on the bare-molecule fraction as a function of magnetic field [Partridge, Phys. Rev. Lett. 95, 020404 (2005)]. Even in this strongly coupled gas of 6Li, the experimental results depend on the structure of the molecules formed in the Feshbach resonance and, therefore, are not universal.
authors.affiliation: Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA.
authors.forename: Juha
authors.initials: J
authors.lastname: Javanainen
authors.forename: Marijan
authors.initials: M
authors.lastname: Kostrun
authors.forename: Matt
authors.initials: M
authors.lastname: Mackie
authors.forename: Andrew
authors.initials: A
authors.lastname: Carmichael