Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture

• Verfasst von: Ulmanis, Juris [VerfasserIn]
• Verfasst von: Häfner, Stephan [VerfasserIn]
• Verfasst von: Pires, Rico Jean-André Agnelo [VerfasserIn]
• Verfasst von: Werner, F. [VerfasserIn]
• Verfasst von: Petrov, D. S. [VerfasserIn]
• Verfasst von: Kuhnle, Eva [VerfasserIn]
• Verfasst von: Weidemüller, Matthias [VerfasserIn]
• Titel: Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture
• Verf.angabe: J. Ulmanis, S. Häfner, R. Pires, F. Werner, D.S. Petrov, E.D. Kuhnle, and M. Weidemüller
• E-Jahr: 2016
• Jahr: 16 February 2016
• Umfang: 7 S.
• Fussnoten: Gesehen am 29.05.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2016
• Band/Heft Quelle: 93(2016,2) Artikel-Nummer 022707, 7 Seiten
• ISSN Quelle: 2469-9934
• DOI: doi:10.1103/PhysRevA.93.022707
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1699033153

Abstract

We study Efimov resonances via three-body loss in an ultracold two-component gas of fermionic 6Li and bosonic 133Cs atoms close to a Feshbach resonance at 843 G, extending results reported previously [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] to temperatures around 120 nK. The experimental scheme for reaching lower temperatures is based upon compensating the gravity-induced spatial separation of the mass-imbalanced gases with bichromatic optical dipole traps. We observe the first and second excited Li-Cs-Cs Efimov resonance in the magnetic field dependence of the three-body event rate constant, in good agreement with the universal zero-range theory at finite temperature [Petrov and Werner, Phys. Rev. A 92, 022704 (2015)]. Deviations are found for the Efimov ground state, and the inelasticity parameter η is found to be significantly larger than those for single-species systems.