Evidence for Efimov quantum states in an ultracold gas of caesium atoms

T. Kraemer, M. Mark, P. Waldburger, J. G. Danzl, C. Chin, B. Engeser, A. D. Lange, K. Pilch, A. Jaakkola, H.-C. Nägerl () and R. Grimm
Additional contact information
T. Kraemer: Universität Innsbruck
M. Mark: Universität Innsbruck
P. Waldburger: Universität Innsbruck
J. G. Danzl: Universität Innsbruck
C. Chin: Universität Innsbruck
B. Engeser: Universität Innsbruck
A. D. Lange: Universität Innsbruck
K. Pilch: Universität Innsbruck
A. Jaakkola: Universität Innsbruck
H.-C. Nägerl: Universität Innsbruck
R. Grimm: Universität Innsbruck

Nature, 2006, vol. 440, issue 7082, 315-318

Abstract: Three Into One Does Go In the bizarre world of quantum physics, three interacting particles can form a loosely bound system even if the two-particle attraction is too weak to allow for the binding of a pair. This exotic trimer state was predicted 35 years ago by Russian physicist Vitali Efimov, who found a remarkable and counterintuitive solution to the notoriously difficult quantum-mechanical three-body problem. Efimov's well known result was a landmark in theoretical few-body physics, but until now these exotic states had not been demonstrated experimentally. Now that has been achieved, in an ultracold gas of caesium atoms. The existence of this gas confirms key predictions and opens up few-body quantum systems to further experiment.

Date: 2006
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DOI: 10.1038/nature04626

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