Theory of rf-spectroscopy of strongly interacting fermions

M. Punk, W. Zwerger

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108 Scopus citations

Abstract

We show that strong pairing correlations in Fermi gases lead to the appearance of a gaplike structure in the rf spectrum, both in the balanced superfluid and in the normal phase above the Clogston-Chandrasekhar limit. The average rf shift of a unitary gas is proportional to the ratio of the Fermi velocity and the scattering length with the final state. In the strongly imbalanced case, the rf spectrum measures the binding energy of a minority atom to the Fermi sea of majority atoms. Our results provide a qualitative understanding of recent experiments by Schunck et al.

Original languageEnglish
Article number170404
JournalPhysical Review Letters
Volume99
Issue number17
DOIs
StatePublished - 25 Oct 2007

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