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.

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References in corpus (18)

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Cited by in corpus (4)

• Heteronuclear Efimov scenario with positive intraspecies scattering length
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium
• A multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance