Sympathetic cooling in an optically trapped mixture of alkali and spin-singlet atoms

Abstract

We report on the realization of a stable mixture of ultracold lithium and ytterbium atoms confined in a far-off-resonance optical dipole trap. We observe sympathetic cooling of 6Li by 174Yb and extract the s-wave scattering length magnitude |a6Li-174Yb| = (13 \pm 3)a0 from the rate of inter-species thermalization. Using forced evaporative cooling of 174Yb, we achieve reduction of the 6Li temperature to below the Fermi temperature, purely through inter-species sympathetic cooling.

arXiv comment4 pages, 3 figures

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• Magic-zero wavelengths of alkali-metal atoms and their applications
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• The prospects of forming ultracold molecules in ${}^2\Sigma$ states by magnetoassociation of alkali-metal atoms with Yb
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• A Three-Dimensional Optical Lattice of Ytterbium and Lithium Atomic Mixture
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• Optical lattices with large scattering length: Using few-body physics to simulate an electron-phonon system
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