Beyond linear response spectroscopy of ultracold Fermi gases

Details Beyond linear response spectroscopy of ultracold Fermi gases Beyond linear response spectroscopy of ultracold Fermi gases

2005-07-11

arxiv.org/abs/cond-mat/0507243v2

Phys. Rev. Lett. 96, 070402 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Text revised, new figures

Scientific paper

10.1103/PhysRevLett.96.070402

We study RF-spectroscopy of ultracold Fermi gas by going beyond the linear response in the field-matter interaction. Higher order perturbation theory allows virtual processes and energy conservation beyond the single particle level. We formulate an effective higher order theory which agrees quantitatively with experiments on the pairing gap, and is consistent with the absence of the mean-field shift in the spin-flip experiment.

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