Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas
arXiv:0803.2517 · doi:10.1103/PhysRevA.78.033614
Abstract
A sufficiently large species imbalance (polarization) in a two-component Feshbach resonant Fermi gas is known to drive the system into its normal state. We show that the resulting strongly-interacting state is a conventional Fermi liquid, that is, however, strongly renormalized by pairing fluctuations. Using a controlled 1/N expansion, we calculate the properties of this state with a particular emphasis on the atomic spectral function, the momentum distribution functions displaying the Migdal discontinuity, and the radio frequency (RF) spectrum. We discuss the latter in the light of the recent experiments of Schunck et al. (cond-mat/0702066) on such a resonant Fermi gas, and show that the observations are consistent with a conventional, but strongly renormalized Fermi-liquid picture.
10 pages, 5 figures; (v2) Numerous minor updates
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Cited by in corpus (16)
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Using photoemission spectroscopy to probe a strongly interacting Fermi gas
- Verification of universal relations in a strongly interacting Fermi gas
- Ultra-cold Polarized Fermi Gases
- Breakdown of Fermi liquid description for strongly interacting fermions
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- Condensed phase of Bose-Fermi mixtures with a pairing interaction
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- Thermodynamic signatures of the polaron-molecule transition in a Fermi gas
- Induced p-wave superfluidity in strongly interacting imbalanced Fermi gases
- Larkin-Ovchinnikov superfluidity in a two-dimensional imbalanced atomic Fermi gas
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- Spectral properties and observables in ultracold Fermi gases
- A Composite Fermion Approach to the Ultracold Dilute Fermi Gas