Momentum-resolved spectroscopy of a Fermi liquid

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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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Original languageEnglish
Article number9539
Pages (from-to)1-10
JournalScientific Reports
Volume5
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

    Research areas

  • BCS-BEC crossover, Fermi liquid, Quantum gas, Tan contact

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