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arXiv · 1411.7207

Momentum-resolved spectroscopy of a Fermi liquid

Elmer V. H. Doggen·Jami J. Kinnunen
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Abstract

We consider a recent momentum-resolved radio-frequency spectroscopy experiment, in which Fermi liquid properties of a strongly interacting atomic Fermi gas were studied. Here we show that by extending the Brueckner-Goldstone model, we can formulate a theory that goes beyond basic mean-field theories and that can be used for studying spectroscopies of dilute atomic gases in the strongly interacting regime. The model hosts well-defined quasiparticles and works across a wide range of temperatures and interaction strengths. The theory provides excellent qualitative agreement with the experiment. Comparing the predictions of the present theory with the mean-field Bardeen-Cooper-Schrieffer theory yields insights into the role of pair correlations, Tan's contact, and the Hartree mean-field energy shift.

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Elmer V. H. Doggen, Jami J. Kinnunen. 2014-11-26. Momentum-resolved spectroscopy of a Fermi liquid. https://doi.org/10.1038/srep09539

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