Phys. Rev. Lett. 99, 170404 (2007) [4 pages]Theory of rf-Spectroscopy of Strongly Interacting FermionsReceived 5 July 2007; published 25 October 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.170404
DOI:
10.1103/PhysRevLett.99.170404
PACS:
03.75.Ss, 05.30.Fk, 32.30.Bv
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