Theory of RF-spectroscopy of strongly interacting Fermions

Details Theory of RF-spectroscopy of strongly interacting Fermions Theory of RF-spectroscopy of strongly interacting Fermions

2007-07-05

arxiv.org/abs/0707.0792v2

Physics

Condensed Matter

Other Condensed Matter

revised version, 4 pages, 3 figures, RevTex4

Scientific paper

10.1103/PhysRevLett.99.170404

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.

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