Observation of the Second Triatomic Resonance in Efimov's Scenario

Abstract

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 $22.7$.

5 pages, 2 figures, 1 table, 1 supplemental material

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• Precision Test of the Limits to Universality in Few-Body Physics
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• Three-body recombination in heteronuclear mixtures at finite temperature
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• Observing a scale anomaly and a universal quantum phase transition in graphene
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• Efimov-van-der-Waals universality for ultracold atoms with positive scattering lengths
• Role of the intraspecies scattering length in the Efimov scenario with large mass difference
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• Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium
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