Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture

Abstract

We study Efimov resonances via three-body loss in an ultracold two-component gas of fermionic ${}^6$Li and bosonic ${}^{133}$Cs atoms close to a Feshbach resonance at 843~G, extending results reported previously [Pires \textit{et al.}, Phys. Rev. Lett. 112, 250404 (2014)] to temperatures around 120~nK. The experimental scheme for reaching lower temperatures is based upon compensating the gravity-induced spatial separation of the mass-imbalanced gases with bichromatic optical dipole traps. We observe the first and second excited Li-Cs-Cs Efimov resonance in the magnetic field dependence of the three-body event rate constant, in good agreement with the universal zero-range theory at finite temperature [Petrov and Werner, Phys. Rev. A 92, 022704 (2015)]. Deviations are found for the Efimov ground state, and the inelasticity parameter $\eta$ is found to be significantly larger than those for single-species systems.

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• Resonantly Interacting Fermi-Fermi Mixture of ${}^{161}$Dy and ${}^{40}$K
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• Shell-shaped Bose-Einstein condensates realized with dual-species mixtures
• Efimov states near a Feshbach resonance and the limits of van der Waals universality at finite background scattering length
• Suppression of Unitary Three-body Loss in a Degenerate Bose-Fermi Mixture
• Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances
• Few-body states of bosons interacting with a heavy quantum impurity
• An effective-field-theory analysis of Efimov physics in heteronuclear mixtures of ultracold atomic gases
• Weakly bound Li He${}_2$ molecules
• Two- and three-body problem with Floquet-driven zero-range interactions
• Tetramer Bound States in Heteronuclear Systems
• Atom-dimer scattering in heteronuclear mixture with finite intra-species scattering length
• General aspects of effective field theories and few-body applications
• An ultracold, optically trapped mixture of {87}Rb and metastable {4}He atoms
• Universal Three-Body Parameter of Heavy-Heavy-Light systems with negative intraspecies scattering length
• Fermions meet two bosons -- the heteronuclear Efimov effect revisited
• Temperature dependence of an Efimov resonance in ${}^{39}\mathrm{K}$
• Universal Efimov Scaling in the Rabi-Coupled Few-Body Spectrum
• Weakly bound LiHe${}_2$ molecules in the framework of three-dimensional Faddeev equations
• An experimental platform for studying the heteronuclear Efimov effect with an ultracold mixture of ${}^6$Li and ${}^{133}$Cs atoms
• Window for Efimov physics for few-body systems with finite-range interactions
• The Efimov effect for heteronuclear three-body systems at positive scattering length and finite temperature
• Observable Resonances in Efimov-unfavored Systems
• Three-body recombination near the d-wave resonance in ultracold ${}^{85}$Rb\,-${}^{87}$Rb mixtures