Scientific Results

Test of the Universality of the Three-Body Efimov Parameter at Narrow Feshbach Resonances

Year: 2013

Authors: Roy S., Landini M., Trenkwalder A., Semeghini G., Spagnolli G., Simoni A., Fattori M., Inguscio M., Modugno G.

Autors Affiliation: LENS and Dipartimento di Fisica e Astronomia, Universita┬┤ di Firenze, and Istituto Nazionale di Ottica, CNR, 50019 Sesto Fiorentino, Italy;
INFN, Sezione di Firenze, 50019 Sesto Fiorentino, Italy;
Institut de Physique de Rennes, UMR 6251, CNRS and Universite┬┤ de Rennes 1, 35042 Rennes Cedex, France

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 K-39 atoms. We study both intermediate and narrow resonances, where the three-body spectrum is expected to be determined by the nonuniversal coupling of two scattering channels. Instead, our observed ratio of the three-body parameter with the van der Waals radius is approximately the same universal ratio as for broader resonances. This unexpected observation suggests the presence of a new regime for three-body scattering at narrow resonances.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 111 (5)      Pages from: 053202  to: 053202

More Information: We thank R. Schmidt, M. Zaccanti, and W. Zwerger for helpful discussions. This work was supported by INFM (MICRA), ERC (Grants No. 203479, No. 247371, and No. 258325), the Agence Nationale de la Recherche (Contract No. ANR-12-BS04-0020-01), and MIUR (PRIN 2009FBKLNN).
DOI: 10.1103/PhysRevLett.111.053202

Citations: 76
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