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arXiv · 1303.3843

Universality of the three-body Efimov parameter at narrow Feshbach resonances

Sanjukta Roy·Manuele Landini·Andreas Trenkwalder·Giulia Semeghini·Giacomo Spagnolli·Andrea Simoni·Marco Fattori·Massimo Inguscio·Giovanni Modugno
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Abstract

We measure the critical scattering length for the appearance of the first three-body bound state, or Efimov three-body parameter, at seven different Feshbach resonances in ultracold 39K atoms. We study both intermediate and narrow resonances, where the three-body spectrum is expected to be determined by the non-universal coupling of two scattering channels. We observe instead approximately the same universal relation of the three-body parameter with the two-body van der Waals radius already found for broader resonances, which can be modeled with a single channel. This unexpected observation suggests the presence of a new regime for three-body scattering at narrow resonances.

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Sanjukta Roy, Manuele Landini, Andreas Trenkwalder, Giulia Semeghini, Giacomo Spagnolli, Andrea Simoni, Marco Fattori, Massimo Inguscio, Giovanni Modugno. 2013-03-15. Universality of the three-body Efimov parameter at narrow Feshbach resonances. https://doi.org/10.1103/physrevlett.111.053202

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