Universality of the Three-Body Parameter for Efimov States in Ultracold Cesium

Year: 2011

Authors: Berninger M., Zenesini A., Huang B., Harm W., Nagerl H.-C., Ferlaino F., Grimm R., Julienne P.S., Hutson J.M.

Autors Affiliation: Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria; Univ Innsbruck, Zentrum Quantenphys, A-6020 Innsbruck, Austria; Austrian Acad Sci, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria; NIST, Joint Quantum Inst, Gaithersburg, MD 20899 USA; Univ Maryland, Gaithersburg, MD 20899 USA; Univ Durham, Dept Chem, Durham DH1 3LE, England

Abstract: We report on the observation of triatomic Efimov resonances in an ultracold gas of cesium atoms. Exploiting the wide tunability of interactions resulting from three broad Feshbach resonances in the same spin channel, we measure magnetic-field dependent three-body recombination loss. The positions of the loss resonances yield corresponding values for the three-body parameter, which in universal few-body physics is required to describe three-body phenomena and, in particular, to fix the spectrum of Efimov states. Our observations show a robust universal behavior with a three-body parameter that stays essentially constant.


Volume: 107(12)      Pages from: 120401-1  to: 120401-5

DOI: 10.1103/PhysRevLett.107.120401