Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances

Abstract

We study Efimov physics of three identical bosons with pairwise multichannel interactions for Feshbach resonances of adjustable width. We find that the two-body multichannel nature of the interaction can affect the universal three-body spectrum, especially for resonances of intermediate width. The shifts in this universal spectrum are caused by trimer states in the closed interaction channels that couple to the universal Efimov states. However, in the narrow resonance limit we find that the Efimov spectrum is set by the resonance width parameter $r^{\ast }$ only independent of the interaction potential considered. In the broad resonance limit all excited Efimov trimer energies approach the ones from the corresponding single-channel system for the scenarios investigated.

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• Pinpointing Feshbach Resonances and Testing Efimov Universalities in ${}^{39}$K
• Efimov scenario for overlapping narrow Feshbach resonances
• Emergent inflation of the Efimov spectrum under three-body spin-exchange interactions
• Efimovian three-body potential from broad to narrow Feshbach resonances
• Universality of Efimov states in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Efimov resonance position near a narrow Feshbach resonance in ${}^6$Li-${}^{133}$Cs mixture
• Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate Continua
• Three-body contact for fermions. I. General relations
• Closed-channel parameters of Feshbach resonances
• Resonance-facilitated three-channel p-wave scattering
• Universal Efimov spectra and fermionic doublets in highly mass-imbalanced cold-atom mixtures with van der Waals and dipole interactions
• Accurate simulation of Efimov physics in ultracold atomic gases with realistic three-body multichannel interactions