Related papers: Capturing the Feshbach-induced Pairing Physics in the BEC-BCS Crossover

Capturing the Feshbach-induced Pairing Physics in the BEC-BCS Crossover

URL: http://arxiv.org/abs/2007.10901v2
Date: Tue, 22 Sep 2020 01:35:28 GMT
Title: Capturing the Feshbach-induced Pairing Physics in the BEC-BCS Crossover
Authors: Eloisa Cuestas, Jos\'e I. Robledo, and Ana P. Majtey
Abstract summary: We reproduce the experimental closed-channel fraction $Z$ across the BEC-BCS crossover and into the BCS regime of a $6$Li atomic Fermi gas. Our results are in agreement with recent measurements of the $Z$ dependency on $T_F$ on the BCS side, where a significant discrepancy between experiments and theory has been repeatedly reported.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: By including the effect of a trap with characteristic energy given by the Fermi temperature $T_F$ 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 $^6$Li atomic Fermi gas. We obtain the expected behavior $Z \propto \sqrt{T_F}$ at unitarity, together with the recently measured proportionality constant. Our results are also in agreement with recent measurements of the $Z$ dependency on $T_F$ on the BCS side, where a significant discrepancy between experiments and theory has been repeatedly reported.

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