Effective interaction between molecules in the strong-coupling BEC regime of a superfluid fermi gas

研究成果: Article査読

16 被引用数 (Scopus)

抄録

We investigate the effective interaction between Cooper-pair molecules in the strong-coupling BEC regime of a superfluid Fermi gas with a Feshbach resonance. Our work uses a path integral formulation and a renormalization group (RG) analysis of fluctuations in a single-channel model. We show that a physical cutoff energy ωc originating from the finite molecular binding energy is the key to understanding the interaction between molecules in the BEC regime. Our work thus clari.es recent results by showing that a M = 2aF is a bare molecular scattering length while a M = (0.6-0.75)aF is the low-energy molecular scattering length renormalized to include high-energy scattering up to ωc (here, aF is the scattering length between Fermi atoms). We also include many-body effects at finite temperatures. We find that aM is strongly dependent on temperature, vanishing at Tc, consistent with the earlier Bose gas results of Bijlsma and Stoof.

本文言語English
ページ(範囲)2659-2662
ページ数4
ジャーナルJournal of the Physical Society of Japan
74
10
DOI
出版ステータスPublished - 2005 10
外部発表はい

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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