The three-body parameter for Efimov states in lithium-6

Abstract

We present a state-of-the-art reanalysis of experimental results on Efimov resonances in the three-fermion system of ${}^6$Li. We discuss different definitions of the 3-body parameter (3BP) for Efimov states, and adopt a definition that excludes effects due to deviations from universal scaling for low-lying states. We develop a finite-temperature model for the case of three distinguishable fermions and apply it to the excited-state Efimov resonance to obtain the most accurate determination to date of the 3BP in an atomic three-body system. Our analysis of ground-state Efimov resonances in the same system yields values for the three-body parameter that are consistent with the excited-state result. Recent work has suggested that the reduced 3BP for atomic systems is a near-universal quantity, almost independent of the particular atom involved. However, the value of the 3BP obtained for ${}^6$Li is significantly ($\sim 20$%) different from that previously obtained from the excited-state resonance in Cs. The difference between these values poses a challenge for theory.

arXiv comment4 figures

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Cited by in corpus (21)

• Efimov Physics: a review
• Universal few-body physics and cluster formation
• Few-body physics in resonantly interacting ultracold quantum gases
• Heteronuclear Efimov scenario with positive intraspecies scattering length
• Three-body recombination in heteronuclear mixtures at finite temperature
• Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture
• Role of the intraspecies scattering length in the Efimov scenario with large mass difference
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
• Efimov physics and the three-body parameter for shallow van der Waals potentials
• Universal range corrections to the Efimov trimer for a class of paths to the unitary limit
• Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium
• Three-body crossover from a Cooper triple to bound trimer state in three-component Fermi gases near a triatomic resonance
• Two- and three-body problem with Floquet-driven zero-range interactions
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance
• Universal Three-Body Parameter of Heavy-Heavy-Light systems with negative intraspecies scattering length
• Long-lived trimers in a quasi-two-dimensional Fermi system
• Temperature dependence of an Efimov resonance in ${}^{39}\mathrm{K}$
• Observability of the Efimov spectrum in an electron-atom-atom system
• Three-body recombination near the d-wave resonance in ultracold ${}^{85}$Rb\,-${}^{87}$Rb mixtures
• Mechanisms of anomalous three-body loss in a population-imbalanced three-component Fermi gas