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arXiv:cond-mat/0505524

Comment on "Structure of a Quantized Vortex near the BCS-BEC Crossover in an Atomic Fermi Gas"

Aurel Bulgac

Published May 20, 2005• 0 citations
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Abstract

A comment on the letter by M. Machida and T. Koyama, Phys. Rev. Lett. {\bf 94}, 140401 (2005) and also on the preprint by Y. Kawaguchi and T. Ohmi, cond-mat/0411018.
DOI
10.48550/arxiv.cond-mat/0505524

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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.