Zuern, G. and Lompe, T. and Wenz, A. N. and Jochim, S. and Julienne, P. S. and Hutson, J. M. (2013) 'Precise characterization of Li-6 Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules.', Physical review letters., 110 (13). p. 135301.
We perform radio-frequency dissociation spectroscopy of weakly bound 6Li2 Feshbach molecules using low-density samples of about 30 molecules in an optical dipole trap. Combined with a high magnetic field stability, this allows us to resolve the discrete trap levels in the radio-frequency dissociation spectra. This novel technique allows the binding energy of Feshbach molecules to be determined with unprecedented precision. We use these measurements as an input for a fit to the 6Li scattering potential using coupled-channel calculations. From this new potential, we determine the pole positions of the broad 6Li Feshbach resonances with an accuracy better than 7×10-4 of the resonance widths. This eliminates the dominant uncertainty for current precision measurements of the equation of state of strongly interacting Fermi gases. As an important consequence, our results imply a corrected value for the Bertsch parameter ξ measured by Ku et al. [ Science 335 563 (2012)], which is ξ=0.370(5)(8).
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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevLett.110.135301|
|Publisher statement:||© 2013 American Physical Society|
|Date accepted:||No date available|
|Date deposited:||28 June 2013|
|Date of first online publication:||2013|
|Date first made open access:||No date available|
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