Resonance superfluidity in an inhomogeneous atomic Fermi gas
Abstract
We consider ballistic expansion of a spherically trapped atomic Fermi gas. In particular, we examine how superfluid Fermion pairs modify the measurable quantities. These pairs can form in the presence of a Feshbach resonance, which can enhance the attractive binary interaction, at the temperatures reached in current experiments. We use HartreeFockBogoliubov equations for the normal density, the pairing field, and the intermediate molecular bound state, which causes the resonance. The contact interactions are characterized by three renormalized parameters, the background scattering length far from resonance, the width of the resonance, and the detuning of the bound state. This approximation for the interactions with a momentum cutoff is equivalent to the full twobody scattering.
 Publication:

APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
 Pub Date:
 May 2003
 Bibcode:
 2003APS..DMP.C5003W