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Precise characterization of Li-6 Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules

Zuern, G.; Lompe, T.; Wenz, A.N.; Jochim, S.; Julienne, P.S.; Hutson, J.M.

Precise characterization of Li-6 Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules Thumbnail


Authors

G. Zuern

T. Lompe

A.N. Wenz

S. Jochim

P.S. Julienne



Abstract

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).

Citation

Zuern, G., Lompe, T., Wenz, A., Jochim, S., Julienne, P., & Hutson, J. (2013). Precise characterization of Li-6 Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules. Physical Review Letters, 110(13), Article 135301. https://doi.org/10.1103/physrevlett.110.135301

Journal Article Type Article
Publication Date Jan 1, 2013
Deposit Date Jun 19, 2013
Publicly Available Date Mar 29, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 110
Issue 13
Article Number 135301
DOI https://doi.org/10.1103/physrevlett.110.135301

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Copyright Statement
© 2013 American Physical Society




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