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arXiv · 0707.0792

Theory of RF-spectroscopy of strongly interacting Fermions

M. Punk·W. Zwerger
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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.

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M. Punk, W. Zwerger. 2007-09-18. Theory of RF-spectroscopy of strongly interacting Fermions. https://doi.org/10.1103/physrevlett.99.170404

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