Heteronuclear Efimov scenario with positive intraspecies scattering length

Abstract

We investigate theoretically and experimentally the heteronuclear Efimov scenario for a three-body system that consists of two bosons and one distinguishable particle with positive intraspecies scattering lengths. The three-body parameter at the three-body scattering threshold and the scaling factor between consecutive Efimov resonances are found to be controlled by the scattering length between the two bosons, approximately independent of short-range physics. We observe two excited-state Efimov resonances in the three-body recombination spectra of an ultracold mixture of fermionic ${}^6$Li and bosonic ${}^{133}$Cs atoms close to a Li-Cs Feshbach resonance, where the Cs-Cs interaction is positive. Deviation of the obtained scaling factor of 4.0(3) from the universal prediction of 4.9 and the absence of the ground state Efimov resonance shed new light on the interpretation of the universality and the discrete scaling behavior of heteronuclear Efimov physics.

arXiv comment6 pages, 3 figures, additional supplemental material

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• From Efimov Physics to the Bose Polaron using Gaussian States
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• Formation of long-range Rydberg molecules in two-component ultracold gases
• Scattering of two heavy Fermi polarons: resonances and quasibound states
• Enhancing the Efimov correlation in Bose polarons with large mass imbalance
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• Squeezing the Efimov effect
• Few-body correlations in two-dimensional Bose and Fermi ultracold mixtures
• 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
• Phase diagram for strong-coupling Bose polarons
• Efimov effect in a $D$-dimensional Born-Oppenheimer approach
• Probing the Efimov discrete scaling in atom-molecule collision
• Three in Many: Efimov physics in the presence of a Fermi sea
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• Tetramer Bound States in Heteronuclear Systems
• Ultracold heteronuclear three-body systems: How diabaticity limits the universality of recombination into shallow dimers
• Long distance optical conveyor-belt transport of ultracold ${}^{133}$Cs and ${}^{87}$Rb atoms
• Universal three-body bound states in mixed dimensions beyond the Efimov paradigm
• 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
• Fast in situ observation of atomic Feshbach resonances by photoassociative ionization
• Universal Efimov Scaling in the Rabi-Coupled Few-Body Spectrum
• Temperature dependence of an Efimov resonance in ${}^{39}\mathrm{K}$
• Asymmetric lineshapes of Efimov resonances in mass-imbalanced ultracold gases
• An experimental platform for studying the heteronuclear Efimov effect with an ultracold mixture of ${}^6$Li and ${}^{133}$Cs atoms
• Dimensional effects in Efimov physics
• Observability of the Efimov spectrum in an electron-atom-atom system
• Three-body recombination near the d-wave resonance in ultracold ${}^{85}$Rb\,-${}^{87}$Rb mixtures
• Quantum Degenerate Mixtures of Cs and Yb
• Observable Resonances in Efimov-unfavored Systems