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

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

2008-03-17

arxiv.org/abs/0803.2517v2

Physical Review A 78, 033614 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 5 figures; (v2) Numerous minor updates

Scientific paper

10.1103/PhysRevA.78.033614

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.

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