Capturing the Feshbach-induced Pairing Physics in the BEC-BCS Crossover
Abstract
By including the effect of a trap with characteristic energy given by the Fermi temperature TF in a two-body two-channel model for Feshbach resonances, we reproduce the experimental closed-channel fraction Z across the BEC-BCS crossover and into the BCS regime of a 6Li atomic Fermi gas. We obtain the expected behavior Z TF at unitarity, together with the recently measured proportionality constant. Our results are also in agreement with recent measurements of the Z dependency on TF on the BCS side, where a significant discrepancy between experiments and theory has been repeatedly reported.
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