Precise Characterization ofLi6Feshbach Resonances Using Trap-Sideband-Resolved RF Spectroscopy of Weakly Bound Molecules
| Autor: | A. N. Wenz, G. Zürn, Thomas Lompe, Paul S. Julienne, Jeremy M. Hutson, Selim Jochim |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 110 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.110.135301 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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