Collisional relaxation of Feshbach molecules and three-body recombination in 87Rb Bose-Einstein condensates

Abstract

We predict the resonance enhanced magnetic field dependence of atom-dimer relaxation and three-body recombination rates in a ${}^{87}$Rb Bose-Einstein condensate (BEC) close to 1007 G. Our exact treatments of three-particle scattering explicitly include the dependence of the interactions on the atomic Zeeman levels. The Feshbach resonance distorts the entire diatomic energy spectrum causing interferences in both loss phenomena. Our two independent experiments confirm the predicted recombination loss over a range of rate constants that spans four orders of magnitude.

arXiv comment4 pages, 3 eps figures (updated references)

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• Quantum Bubbles in Microgravity
• Excited Thomas-Efimov levels in ultracold gases
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• Ultracold three-body collisions near narrow Feshbach resonances
• Spectroscopy of the a^3Σ_u^+ state and the coupling to the X^1Σ_g^+ state of K_2
• Formation of deeply bound molecules via chainwise adiabatic passage
• Finite-range effects in Efimov physics beyond the separable approximation
• Dynamically Slowed Collapse of a Bose-Einstein Condensate with Negative Scattering Length
• Interacting non-Hermitian ultracold atoms in a harmonic trap: Two-body exact solution and high-order exceptional point
• The multichannel nature of three-body recombination for ultracold ${}^{39}$K
• Energy-dependent 3-body loss in 1D Bose gases
• Feshbach resonances in 3He*-4He* mixtures
• Emergent inflation of the Efimov spectrum under three-body spin-exchange interactions
• Hartree-Fock-Bogoliubov Model and Simulation of Attractive and Repulsive Bose-Einstein Condensates
• Efficient three-body calculations with a two-body mapped grid method
• Effect of finite range interactions on roton mode softening in a multi-component BEC
• Accurate simulation of Efimov physics in ultracold atomic gases with realistic three-body multichannel interactions