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

M. Berninger, A. Zenesini, B. Huang, W. Harm, H.-C. Nägerl, F. Ferlaino, R. Grimm, P. S. Julienne, and J. M. Hutson
Phys. Rev. Lett. 107, 120401 – Published 14 September 2011

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.

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  • Received 20 June 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.120401

© 2011 American Physical Society

Authors & Affiliations

M. Berninger1, A. Zenesini1, B. Huang1, W. Harm1, H.-C. Nägerl1, F. Ferlaino1, R. Grimm1,2, P. S. Julienne3, and J. M. Hutson4

  • 1Institut für Experimentalphysik and Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
  • 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria
  • 3Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, Maryland 20899-8423, USA
  • 4Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom

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Vol. 107, Iss. 12 — 16 September 2011

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