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Phys Rev Lett. 2014 May 16;112(19):190401. Epub 2014 May 12.

Observation of the second triatomic resonance in Efimov's scenario.

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Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria.
Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria and Institut für Quantenoptik und Quanteninformation (IQOQI), Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria.
Joint Quantum Centre (JQC) Durham/Newcastle, Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom.


We report the observation of a three-body recombination resonance in an ultracold gas of cesium atoms at a very large negative value of the s-wave scattering length. The resonance is identified as the second triatomic Efimov resonance, which corresponds to the situation where the first excited Efimov state appears at the threshold of three free atoms. This observation, together with a finite-temperature analysis and the known first resonance, allows the most accurate demonstration to date of the discrete scaling behavior at the heart of Efimov physics. For the system of three identical bosons, we obtain a scaling factor of 21.0(1.3), close to the ideal value of 22.7.

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