Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas

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

References in corpus (5)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Polarization Measurements and the Pairing Gap in the Universal Regime
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms

Cited by in corpus (1)

• Using photoemission spectroscopy to probe a strongly interacting Fermi gas