Efimov Resonance and Three-Body Parameter in a Lithium-Rubidium Mixture

R. A. W. Maier, M. Eisele, E. Tiemann, and C. Zimmermann
Phys. Rev. Lett. 115, 043201 – Published 24 July 2015
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Abstract

We study collisional heating in a cold Li7Rb87 mixture near a broad Feshbach resonance at 661 G. At the high field slope of the resonance, we find an enhanced three-body recombination rate that we interpret as a heteronuclear Efimov resonance. With improved Feshbach spectroscopy of two further resonances, a model for the molecular potentials has been developed that now consistently explains all known Feshbach resonances of the various Li-Rb isotope mixtures. The model is used to determine the scattering length of the observed Efimov state. Its value of 1870a0 Bohr radii supports the currently discussed assumption of universality of the three-body parameter also in heteronuclear mixtures.

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  • Received 11 November 2014

DOI:https://doi.org/10.1103/PhysRevLett.115.043201

© 2015 American Physical Society

Authors & Affiliations

R. A. W. Maier1, M. Eisele1, E. Tiemann2, and C. Zimmermann1

  • 1Physikalisches Institut, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
  • 2Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany

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Vol. 115, Iss. 4 — 24 July 2015

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