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

• Verfasst von: Zürn, Gerhard [VerfasserIn]
• Verfasst von: Wenz, André Niklas [VerfasserIn]
• Verfasst von: Jochim, Selim [VerfasserIn]
• Titel: Precise characterization of 6Li Feshbach resonances using trap-sideband-resolved RF spectroscopy of weakly bound molecules
• Verf.angabe: G. Zürn, T. Lompe, A.N. Wenz, S. Jochim, P.S. Julienne, and J.M. Hutson
• E-Jahr: 2013
• Jahr: 25 March 2013
• Umfang: 5 S.
• Teil: volume:110
• Teil: year:2013
• Teil: number:13
• Teil: elocationid:135301
• Teil: pages:1-5
• Teil: extent:5
• Fussnoten: Im Titel ist die Zahl 6 hochgestellt ; Gesehen am 02.08.2021
• Titel Quelle: Enthalten in: Physical review letters
• Ort Quelle: College Park, Md. : APS, 1958
• Jahr Quelle: 2013
• Band/Heft Quelle: 110(2013), 13, Artikel-ID 135301, Seite 1-5
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.110.135301
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1765234794

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).