Dimers of ultracold two-component Fermi gases on magnetic-field Feshbach resonance

Details Dimers of ultracold two-component Fermi gases on magnetic-field Feshbach resonance Dimers of ultracold two-component Fermi gases on magnetic-field Feshbach resonance

2004-03-26

arxiv.org/abs/cond-mat/0403652v4

Physics

Condensed Matter

Soft Condensed Matter

RevTex, 4 pages

Scientific paper

At the location of a magnetic-field Feshbach resonance, a mixture gas of fermionic atoms and dimers of fermionic atom pairs is investigated in the unitarity limit where the absolute value of the scattering length is much larger than the mean distance between atoms. The dynamic equilibrium of the mixture gases is characterized by the minimum of the Gibbs free energy. For the fermionic atoms and dimers with divergent scattering length, it is found that the fraction of the dimers based on a very simple theory agrees with the high fraction of zero-momentum molecules observed in a recent experiment (M. W. Zwierlein et al, Phys. Rev. Lett. 92, 120403 (2004)). The dimeric gas can be also used to interpret the frequency of the radial breathing mode observed in the experiment by J. Kinast et al (Phys. Rev. Lett. 92, 150402 (2004)).

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