Population of closed-channel molecules in trapped Fermi gases with broad Feshbach resonances

Details Population of closed-channel molecules in trapped Fermi gases with broad Feshbach resonances Population of closed-channel molecules in trapped Fermi gases with broad Feshbach resonances

2005-05-27

arxiv.org/abs/cond-mat/0505689v2

Phys. Rev. Lett. 95, 260406 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, published in PRL

Scientific paper

10.1103/PhysRevLett.95.260406

We compute the fraction of closed-channel molecules in trapped atomic Fermi gases, over the entire range of accessible fields and temperatures. We use a two-channel model of BCS--Bose-Einstein condensation (BEC) crossover theory at general temperature $T$, and show that this fraction provides a measure of the $T$ dependent pairing gap. Our calculations, containing no free parameters, are in good quantitative agreement with recent low $T$ measurements in $^6$Li. We present readily testable predictions for the dependencies of the closed-channel fraction on temperature and Fermi momentum.

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