Abstract.
We consider the normal state of a dense ultracold atomic Fermi gas in the presence of a Feshbach resonance. We study the BCS and the molecular instabilities and their interplay, within the framework of a recent many-body approach. We find surprisingly that, in the temperature domain where the BCS phase is present, there is a non zero lower bound for the binding energy of molecules at rest. This could give an experimental mean to show the existence of the BCS phase without observing it directly.
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Combescot, R. Threshold of molecular bound state and BCS transition in dense ultracold Fermi gases with Feshbach resonance. Eur. Phys. J. D 32, 69–73 (2005). https://doi.org/10.1140/epjd/e2004-00186-y
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DOI: https://doi.org/10.1140/epjd/e2004-00186-y