Abstract
We describe recent radio-frequency (rf) spectroscopic studies of two-component Fermi gases of Li atoms, where we have determined the fermion pair size and the pairing gap energy in a resonantlyinteracting Fermi superfluid. Homogeneous rf spectra are obtained by tomographically resolving the spectral response of an inhomogeneous, trapped sample. The final-state interaction effect is minimized by realizing a new superfluid spin mixture. Quasiparticles in a polarized superfluid lead to a local bimodal spectral response, allowing us to determine the superfluid gap. The pair size and the gap energy have been determined to be 20% smaller than the interparticle spacing and 44% of the Fermi energy, respectively, which are the smallest pair and the largest gap so far observed in fermionic superfluids.
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