Universal three-body physics in ultracold KRb mixtures

Abstract

Ultracold atomic gases have recently become a driving force in few-body physics due to the observation of the Efimov effect. While initially observed in equal mass systems, one expects even richer few-body physics in the heteronuclear case. In previous experiments with ultracold mixtures of potassium and rubidium, an unexpected non-universal behavior of Efimov resonances was observed. In contrast, we measure the scattering length dependent three-body recombination coefficient in ultracold heteronuclear mixtures of ${}^{39}\mathrm{K}$-\87Rb and ${}^{41}\mathrm{K}$-\87Rb and do not observe any signatures of Efimov resonances for accessible scattering lengths in either mixture. Our results show good agreement with our theoretical model for the scattering dependent three-body recombination coefficient and reestablish universality across isotopic mixtures.

5 pages, 4 figures, 1 table in supplementary material

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• Few-body correlations in two-dimensional Bose and Fermi ultracold mixtures
• Squeezing the Efimov effect
• Isotopic shift of atom-dimer Efimov resonances in K-Rb mixtures: Critical effect of multichannel Feshbach physics
• Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances
• Observation of low-field Feshbach resonances between ${}^{161}$Dy and ${}^{40}$K
• Probing the Efimov discrete scaling in atom-molecule collision
• Observation of Dynamical Super Efimovian Expansion in a Unitary Fermi Gas
• Efimov states of three unequal bosons in non-integer dimensions
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance
• Efimov resonance position near a narrow Feshbach resonance in ${}^6$Li-${}^{133}$Cs mixture
• Dynamical excitation processes and correlations of three-body two-dimensional mixtures
• Universal Three-Body Parameter of Heavy-Heavy-Light systems with negative intraspecies scattering length
• Correlated Gaussian Approach to Anisotropic Resonantly Interacting Few-Body Systems
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• Window for Efimov physics for few-body systems with finite-range interactions
• Three-body Physics in the Impurity Limit of 39K Bose-Einstein Condensates
• Quasi-integrability and nonlinear resonances in cold atoms under modulation
• Three-body recombination near the d-wave resonance in ultracold ${}^{85}$Rb\,-${}^{87}$Rb mixtures
• Observable Resonances in Efimov-unfavored Systems