2023/02/17 by Ningning Gao, Gao, Ning-Ning, Huili Han +3
Chemistry · Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Cold Atom Physics and Bose-Einstein Condensates #Electrostatics and Colloid Interactions #FOS: Physical sciences #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2302.08640
openalex publication_date 2023/02/17 · openalex created_date 2023/02/22 · openalex updated_date 2026/07/28
The study of Efimov features and their relationships in 40K-87Rb Mixtures has generated extensive discussion, yet the discrepancy between Efimov universality predictions based on the zero-range approximation and experimental observations remains unresolved. In this study, we investigate the three-body collision properties with J=0 symmetry for a 87Rb-87Rb-40K system on both sides of Rb-K scattering length to understand the mechanisms underlying this discrepancy. Our approach employs the R-matrix propagation method within a hyperspherical coordinate frame, utilizing the Lennard-Jones model potential to describe atom interactions. We predicts the existence of three-body shape resonances at large negative Rb-K scattering lengths, which leads to the enhancement of three-body recombination rates. On the positive Rb-K scattering length side, we find an Efimov recombination minimum beyond the range of previous measurements. These Efimov features, combined with experimental observations of the atom-dimer Efimov resonance, offer an opportunity to test the universality of Efimov features. Our study demonstrates the influence of finite-range effects and non-resonant intraspecies scattering length in 40K-87Rb mixtures, providing valuable insights into the universal relations between Efimov features in heteronuclear systems.