The multichannel nature of three-body recombination for ultracold ${}^{39}$K

Abstract

We develop a full multichannel spin model in momentum space to investigate three-body recombination of identical alkali-metal atoms colliding in a magnetic field. The model combines the exact three-atom spin structure and realistic pairwise atom-atom interactions. By neglecting the interaction between two particles when the spectating particle is not in its initial spin state we arrive at an approximate model. With this approximate model we achieve excellent agreement with the recent precise measurement of the ground Efimov resonance position in potassium-39 close to 33.58 G [Chapurin $et$ $al$., Phys. Rev. Lett. 123, 233402 (2019)]. We analyze the limitations of our approximation by comparing to the numerical results for the full system and find that it breaks down for Feshbach resonances at larger magnetic fields in the same spin channel. There the relevant three-body closed channel thresholds are much closer to the open channel threshold, which enhances the corresponding multichannel couplings. Therefore the neglected components of the interaction should be included for those Feshbach resonances.

References in corpus (12)

• Observation of an Efimov spectrum in an atomic system
• Three-boson problem near a narrow Feshbach resonance
• Observation of universality in ultracold 7Li three-body recombination
• Analytical solution of the bosonic three-body problem
• Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter
• Potassium ground state scattering parameters and Born-Oppenheimer potentials from molecular spectroscopy
• Adiabatic hyperspherical study of triatomic helium systems
• Universal van der Waals Physics for Three Ultracold Atoms
• Excited Thomas-Efimov levels in ultracold gases
• The Efimov effect in lithium 6
• Observation of Efimov Universality across a Non-Universal Feshbach Resonance in \textsuperscript{39}K
• Collisional relaxation of Feshbach molecules and three-body recombination in 87Rb Bose-Einstein condensates

Cited by in corpus (14)

• Three-body recombination in physical chemistry
• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• Spin-conservation propensity rule for three-body recombination of ultracold Rb atoms
• Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances
• Strong spin-exchange recombination of three weakly interacting ${}^7$Li atoms
• Reshaped Three-Body Interactions and the Observation of an Efimov State in the Continuum
• Production and stabilization of a spin mixture of ultracold dipolar Bose gases
• Efimovian three-body potential from broad to narrow Feshbach resonances
• Emergent inflation of the Efimov spectrum under three-body spin-exchange interactions
• Energy-scaling of the product state distribution for three-body recombination of ultracold atoms
• Three-body spin mixing in spin-1 Bose-Einstein condensates
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance
• Spin structure of diatomic van der Waals molecules of alkali atoms
• Accurate simulation of Efimov physics in ultracold atomic gases with realistic three-body multichannel interactions