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Efimov physics is a universal phenomenon arising in quantum three-bodysystems. For systems with resonant two-body interactions, Efimov predicted aninfinite series of three-body bound states with geometric scaling symmetry.These Efimov states were first observed in cold Cs atoms and have since beenreported in a variety of atomic systems. While theories predict non-universalbehavior for narrow Feshbach resonances, experiments on Efimov resonances areso far consistent with predictions based on universal theories. Here wedirectly compare the Efimov spectra in a $^6$Li-$^{133}$Cs mixture near twoFeshbach resonances which are very different in their resonance strengths butotherwise almost identical. Our result shows a clear dependence of the Efimovresonance positions on Feshbach resonance strength and a clear departure fromthe universal prediction for the narrow Feshbach resonance.

Testing universality of Efimov physics across broad and narrow Feshbach resonances