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Journal Articles Physical Review A : Atomic, molecular, and optical physics [1990-2015] Year : 2016

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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hal-01289209 , version 1 (21-01-2022)

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J. Ulmanis, S. Häfner, R. Pires, Felix Werner, D. S. Petrov, et al.. Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2016, 93 (2), pp.022707. ⟨10.1103/PhysRevA.93.022707⟩. ⟨hal-01289209⟩
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