Quantum Degenerate Mixtures of Cs and Yb

Wilson, K.E.; Guttridge, A.; Segal, J.; Cornish, S.L.

Abstract

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

Citation

Wilson, K., Guttridge, A., Segal, J., & Cornish, S. (2021). Quantum Degenerate Mixtures of Cs and Yb. Physical Review A, 103, Article 033306. https://doi.org/10.1103/physreva.103.033306

• Journal Article Type: Article
• Acceptance Date: Jan 21, 2021
• Online Publication Date: Mar 9, 2021
• Publication Date: 2021-03
• Deposit Date: Nov 12, 2020
• Publicly Available Date: Sep 23, 2021
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 103
• Article Number: 033306
• DOI: https://doi.org/10.1103/physreva.103.033306
• Public URL: https://durham-repository.worktribe.com/output/1257328
• Related Public URLs: https://arxiv.org/abs/2011.05436