Measurement of an Efimov trimer binding energy in a three-component mixture of 6Li

Understand

The binding energy of an Efimov trimer state was precisely determined via radio-frequency association.

• It is found that the measurement results significantly shift with temperature, but that the shift can be made negligible at the lowest temperature in our experiment.
• The obtained trimer binding energy reveals a significant deviation from the nonuniversal theory prediction based on a three-body parameter with a monotonic energy dependence.