Quantum degenerate mixtures of Cs and Yb

Wilson, Kali E. and Guttridge, Alexander and Segal, Jack and Cornish, Simon L. (2021) Quantum degenerate mixtures of Cs and Yb. Physical Review A, 103 (3). 033306. ISSN 1050-2947 (https://doi.org/10.1103/PhysRevA.103.033306)

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Abstract

We report the production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive ( Cs + 174 Yb ) and repulsive ( Cs + 170 Yb ) interspecies interactions. Dual-species evaporation is performed in a bichromatic optical dipole trap that combines light at 1070 nm and 532 nm to enable control of the relative trap depths for Cs and Yb. Maintaining a trap which is shallower for Yb throughout the evaporation leads to highly efficient sympathetic cooling of Cs for both isotopic combinations at magnetic fields close to the Efimov minimum in the Cs three-body recombination rate at around 22 G. For Cs + 174 Yb , we produce quantum mixtures with typical atom numbers of N Yb ∼ 5 × 10 4 and N Cs ∼ 5 × 10 3 . We find that the attractive interspecies interaction (characterized by the scattering length a CsYb = − 75 a 0 ) is stabilized by the repulsive intraspecies interactions. For Cs + 170 Yb , we produce quantum mixtures with typical atom numbers of N Yb ∼ 4 × 10 4 and N Cs ∼ 1 × 10 4 . Here, the repulsive interspecies interaction ( a CsYb = 96 a 0 ) can overwhelm the intraspecies interactions, such that the mixture sits in a region of partial miscibility.

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