Test of the Universality of the Three-Body Efimov Parameter at Narrow Feshbach Resonances
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).KeyWords: Bound state; Feshbach resonances; Narrow resonances; Scattering channels; Scattering length; Ultra-cold; Universal ratios; Van der Waals radius, Scattering; Van der Waals forces, ResonanceDOI: 10.1103/PhysRevLett.111.053202Citations: 76data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-10-20References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here