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Evidence for Universal Four-Body States Tied to an Efimov Trimer

F. Ferlaino, S. Knoop, M. Berninger, W. Harm, J. P. D’Incao, H.-C. Nägerl, and R. Grimm
Phys. Rev. Lett. 102, 140401 – Published 6 April 2009
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Abstract

We report on the measurement of four-body recombination rate coefficients in an atomic gas. Our results obtained with an ultracold sample of cesium atoms at negative scattering lengths show a resonant enhancement of losses and provide strong evidence for the existence of a pair of four-body states, which is strictly connected to Efimov trimers via universal relations. Our findings confirm recent theoretical predictions and demonstrate the enrichment of the Efimov scenario when a fourth particle is added to the generic three-body problem.

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  • Received 6 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.140401

©2009 American Physical Society

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Ultracold experiments strike universal physics—again

Published 6 April 2009

An ultracold atomic physics experiment reveals universal physics in a four-body system.

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Authors & Affiliations

F. Ferlaino1, S. Knoop1, M. Berninger1, W. Harm1, J. P. D’Incao2,3, H.-C. Nägerl1, and R. Grimm1,2

  • 1Institut für Experimentalphysik and Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
  • 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria
  • 3JILA, University of Colorado and NIST, Boulder, Colorado 80309-0440, USA

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Issue

Vol. 102, Iss. 14 — 10 April 2009

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