title: Temperature and final state effects in radio frequency spectroscopy experiments on atomic fermi gases.
abstract: We present a simple and systematic characterization of the radio frequency (rf) spectra of homogeneous, paired atomic Fermi gases at general temperatures T in the presence of final-state interactions. The spectra, consisting of possible bound states and positive as well as negative detuning (nu) continua, satisfy exactly the zeroth- and first-moment sum rules at all T. We show how to best extract the pairing gap and how to detect the nu<0 continuum arising from thermally excited quasiparticles, not yet seen experimentally. We explain semiquantitatively recent rf experiments on "bound-bound" transitions, predicting effects of varying temperature.
authors.affiliation: James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Yan
authors.initials: Y
authors.lastname: He
authors.forename: Chih-Chun
authors.initials: CC
authors.lastname: Chien
authors.forename: Qijin
authors.initials: Q
authors.lastname: Chen
authors.forename: K
authors.initials: K
authors.lastname: Levin