Beyond linear response spectroscopy of ultracold fermi gases

J. Kinnunen*, P. Törmä

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


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 languageEnglish
Article number070402
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 24 Feb 2006
MoE publication typeA1 Journal article-refereed


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