The model which we have recently proposed to describe the behavior of a dilute Fermi gas in the presence of a Fechbach resonance (M. Holland, S.J.J.M.F. Kokkelmans, M.L. Chiofalo, and R. Walser, Phys. Rev. Lett. 87), 120406 (2001). (S.J.J.M.F. Kokkelmans, J.N. Milstein, M.L. Chiofalo, R. Walser, and M.J. Holland, e-print cond-mat/0112283.) has been extended to take into account the first order effects of pairing fluctuations. Within the context of a path integral formalism, we discuss a model which describes the crossover between the strong and weak coupling regimes of a dilute Fermi gas in the presence of a Feschbach resonance. With this model we are able to connect between the weak coupling BCS-regime and the strongly coupled BEC limits by modifying the detuning of the resonant state. Even though the scattering length goes through a singularity in the intermediate coupling regime, the curves connecting these regimes remains smooth.
|Publication status||Published - 1 May 2002|
|Event||33rd Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics (DAMOP), May 29-June 1, 2002, Williamsburg, VA, USA - Williamsburg, United States|
Duration: 29 Jun 2002 → 1 Jul 2002
|Conference||33rd Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics (DAMOP), May 29-June 1, 2002, Williamsburg, VA, USA|
|Abbreviated title||DAMOP 2002|
|Period||29/06/02 → 1/07/02|