Coherence and clock shifts in ultracold Fermi gases with resonant interactions

Details Coherence and clock shifts in ultracold Fermi gases with resonant interactions Coherence and clock shifts in ultracold Fermi gases with resonant interactions

2007-07-05

arxiv.org/abs/0707.0859v1

Phys. Rev. Lett. 99, 190407 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures. Nordita preprint NORDITA-2007-23

Scientific paper

10.1103/PhysRevLett.99.190407

Using arguments based on sum rules, we derive a general result for the average shifts of rf lines in Fermi gases in terms of interatomic interaction strengths and two-particle correlation functions. We show that near an interaction resonance shifts vary inversely with the atomic scattering length, rather than linearly as in dilute gases, thus accounting for the experimental observation that clock shifts remain finite at Feshbach resonances.

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