A detailed analysis of threshold behavior for the Efimov effect

A. Baishya, Satyaranjan Santra, Tanya Singh +7 more

Miwae Yamazaki

Di Shu, I. Simbotin, Robin Côté

Abstract We investigate the energy dependence of inelastic processes in systems which possess Efimov states. We consider the three‐body recombination rate K3 where three free atoms interact to produce an atom–dimer pair, and the relaxation rate Krel where an atom quenches a weakly bound state of a dimer near an Efimov resonance to more deeply bound levels. Using a model capturing the key features of the Efimov problem, we identify new energy regimes for K3, namely the near threshold resonance (NTR) regime behavior E−2 for negative scattering lengths and the near threshold suppression (NTS) regime behavior E2 for positive scattering lengths. We also confirm a previously found oscillatory behavior of K3 at higher energy E. Finally, we find that Krel behaves as E−1 in the NTR regime.

A. C. Fonseca, Edward F. Redish, Paul E. Shanley

Olga Machtey, Zav Shotan, Noam Gross +1 more

We develop an experimental technique for rf association of Efimov trimers from a three-atom continuum. We apply it to probe the lowest accessible Efimov energy level in bosonic lithium in the region where strong deviations from the universal behavior are expected, and provide a quantitative study of this effect. The position of the Efimov resonance at the atom-dimer threshold, measured using a different experimental technique, concurs with the rf association results.

Lucas Platter