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.

arXiv comment14 pages, 9 figures, 3 tables

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• From Efimov Physics to the Bose Polaron using Gaussian States
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• Probing open- and closed-channel p-wave resonances
• The multichannel nature of three-body recombination for ultracold ${}^{39}$K
• Spin-conservation propensity rule for three-body recombination of ultracold Rb atoms
• Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances
• Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum
• Strong spin-exchange recombination of three weakly interacting ${}^7$Li atoms
• Efimov scenario for overlapping narrow Feshbach resonances
• Observation of Microwave Shielding of Ultracold Molecules
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance
• Universality of Efimov states in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Efimov resonance position near a narrow Feshbach resonance in ${}^6$Li-${}^{133}$Cs mixture
• Spin hierarchy in van der Waals molecule formation via ultracold three-body recombination
• Interferometry of Efimov states in thermal gases by modulated magnetic fields
• Ultracold molecular collisions in magnetic fields: Efficient incorporation of hyperfine structure in the total rotational angular momentum representation
• Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate Continua
• Three-body recombination in a single-component Fermi gas with $p$-wave interaction
• 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
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• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates
• Three-body recombination near the d-wave resonance in ultracold ${}^{85}$Rb\,-${}^{87}$Rb mixtures
• Delta-Kick Collimation of Heteronuclear Feshbach Molecules