Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances

Abstract

We study the interspecies scattering properties of ultracold Li-Cs mixtures in their two energetically lowest spin channels in the magnetic field range between 800 G and 1000 G. Close to two broad Feshbach resonances we create weakly bound LiCs dimers by radio-frequency association and measure the dependence of the binding energy on the external magnetic field strength. Based on the binding energies and complementary atom loss spectroscopy of three other Li-Cs s-wave Feshbach resonances we construct precise molecular singlet and triplet electronic ground state potentials using a coupled-channels calculation. We extract the Li-Cs interspecies scattering length as a function of the external field and obtain almost a ten-fold improvement in the precision of the values for the pole positions and widths of the s-wave Li-Cs Feshbach resonances as compared to our previous work [Pires \textit{et al.}, Phys. Rev. Lett. \textbf{112}, 250404 (2014)]. We discuss implications on the Efimov scenario and the universal geometric scaling for LiCsCs trimers.

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Cited by in corpus (10)

• Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate
• Heteronuclear Efimov scenario with positive intraspecies scattering length
• Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances
• Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium
• Three in Many: Efimov physics in the presence of a Fermi sea
• Ultracold heteronuclear three-body systems: How diabaticity limits the universality of recombination into shallow dimers
• Efimov resonance position near a narrow Feshbach resonance in ${}^6$Li-${}^{133}$Cs mixture
• Asymmetric lineshapes of Efimov resonances in mass-imbalanced ultracold gases
• Window for Efimov physics for few-body systems with finite-range interactions
• Density effects on the interferometry of Efimov states by modulating magnetic fields