Abstract
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.
Original language | English |
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Article number | 070402 |
Pages (from-to) | 1-4 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 96 |
Issue number | 7 |
DOIs | |
Publication status | Published - 24 Feb 2006 |
MoE publication type | A1 Journal article-refereed |