Theory of RF-spectroscopy of strongly interacting Fermions

Abstract

We show that strong pairing correlations in Fermi gases lead to the appearance of a gap-like 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.

arXiv commentrevised version, 4 pages, 3 figures, RevTex4

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Cited by in corpus (101)

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• Bose polarons near quantum criticality
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