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Quantum Degenerate Mixtures of Cs and Yb

Wilson, K.E. and Guttridge, A. and Segal, J. and Cornish, S.L. (2021) 'Quantum Degenerate Mixtures of Cs and Yb.', Physical Review A, 103 . 033306.


We report the production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive (Cs + 174Yb) and repulsive (Cs + 170Yb) 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 + 174Yb, we produce quantum mixtures with typical atom numbers of NYb ∼ 5 × 104 and NCs ∼ 5 × 103. We find that the attractive interspecies interaction (characterized by the scattering length aCsYb = −75a0) is stabilized by the repulsive intraspecies interactions. For Cs + 170Yb, we produce quantum mixtures with typical atom numbers of NYb ∼ 4 × 104 and NCs ∼ 1 × 104. Here, the repulsive interspecies interaction (aCsYb = 96a0) can overwhelm the intraspecies interactions, such that the mixture sits in a region of partial miscibility

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Publisher statement:Reprinted with permission from the American Physical Society: Wilson, K.E., Guttridge, A., Segal, J. & Cornish, S.L. (2021). Quantum Degenerate Mixtures of Cs and Yb. Physical Review A 103: 033306. © 2021 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:21 January 2021
Date deposited:23 September 2021
Date of first online publication:09 March 2021
Date first made open access:23 September 2021

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