4.5 Article

A generalized molecule approach capturing the Feshbach-induced pairing physics in the BEC-BCS crossover

期刊

JOURNAL OF PHYSICS-CONDENSED MATTER
卷 33, 期 25, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/abf7a2

关键词

ultracold atoms; Fermi gases; BEC-BCS crossover; Feshbach molecules

资金

  1. ANPCyT [PICT-BID 2017-2583]
  2. Grant GRFT-2018 MINCYT-Cordoba
  3. SeCyT-UNC
  4. CONICET

向作者/读者索取更多资源

By incorporating the effect of a trap with characteristic energy given by the Fermi temperature TF into a two-channel model for Feshbach resonances, the study successfully reproduces the binding energy of ultracold molecules and closed-channel fraction Z in atomic Fermi gases. The results are consistent with the expected behavior of Z proportional to root TF at unitarity, as well as recent measurements of the Z dependency on TF, providing valuable insights for future experiments.
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 measured binding energy of ultracold molecules in a K-40 atomic Fermi gas. We also reproduce the experimental closed-channel fraction Z across the BEC-BCS crossover and into the BCS regime of a Li-6 atomic Fermi gas. We obtain the expected behavior Z proportional to root 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 quantitative discrepancy between experimental data and theory's predictions has been repeatedly reported. In order to contrast with future experiments we report the proportionality constant at unitarity between Z and root T-F predicted by our model for a K-40 atomic Fermi gas.

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