Observation of Efimov Universality across a Non-Universal Feshbach Resonance in \textsuperscript{39}K

Abstract

We study three-atom inelastic scattering in ultracold \textsuperscript{39}K near a Feshbach resonance of intermediate coupling strength. The non-universal character of such resonance leads to an abnormally large Efimov absolute length scale and a relatively small effective range $r_e$, allowing the features of the \textsuperscript{39}K Efimov spectrum to be better isolated from the short-range physics. Meticulous characterization of and correction for finite temperature effects ensure high accuracy on the measurements of these features at large-magnitude scattering lengths. For a single Feshbach resonance, we unambiguously locate four distinct features in the Efimov structure. Three of these features form ratios that obey the Efimov universal scaling to within 10\%, while the fourth feature, occurring at a value of scattering length closest to $r_e$, instead deviates from the universal value.

14 pages, 9 figures, 3 tables

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• Quantum Monte Carlo studies of a trimer scaling function with microscopic two- and three-body interactions
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• Closed-channel parameters of Feshbach resonances
• The role of the effective range in strongly-interacting few-body systems
• Universal Efimov spectra and fermionic doublets in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates
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• Delta-Kick Collimation of Heteronuclear Feshbach Molecules