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.

6 pages, 3 figures, additional supplemental material

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Cited by in corpus (14)

• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Enhancing the Efimov correlation in Bose polarons with large mass imbalance
• Phase diagram for strong-coupling Bose polarons
• Three in Many: Efimov physics in the presence of a Fermi sea
• Probing the Efimov discrete scaling in atom-molecule collision
• 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
• 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 Efimov Scaling in the Rabi-Coupled Few-Body Spectrum
• 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
• Observable Resonances in Efimov-unfavored Systems
• Quantum Degenerate Mixtures of Cs and Yb