Preparation of a quasi-two-dimensional Bose mixture of ultracold Na <mml:mprescripts/> <mml:none/> 23 and Rb <mml:mprescripts/> <mml:none/> 87 atoms

2026/04/30 by Anonymous, Ji-Kai Liao, Hao-Ran Zhang +6
Physics and Astronomy · #Atom (system on chip) #Field (mathematics) #Quantum #Spectral line #cond-mat.quant-gas #physics.atom-ph

paper · pdf · doi:10.1103/tr78-m3jb

published in Physical Review A 114(2) (American Physical Society) · 13 pages, 9 figures in total. To be published in Physical Review A

openalex publication_date 2026/07/07 · openalex created_date 2026/07/08 · arxiv created 2026/07/09 · openalex updated_date 2026/08/05 · arxiv updated 2026/08/06

Abstract

Quantum gases confined in reduced dimensions have enabled the observation of many exotic quantum phenomena. While existing experiments primarily focus on homonuclear systems, we report here on the efficient preparation of a quasi-two-dimensional (2D) heteronuclear quantum degenerate mixture of ultracold ²³Na and ⁸⁷Rb. We describe the design of the vacuum system and detail the experimental procedures for preparing the 2D quantum mixture. The designed apparatus has several unique features, including compact and modular 2D-MOT sources, a science chamber that accommodates various lattice geometries, a precision in-vacuum electrode assembly, and high-resolution imaging for both atomic species. After loading the dual-species condensate into a single layer of a vertical optical lattice, we prepare a 2D gas mixture and observe quantum immiscibility in the in-situ equilibrium density profiles. The observed density profiles agree well with mean-field theories. The apparatus provides a versatile platform for investigating several interesting problems, including quantum impurities, quantum droplets, or polar molecules in low dimensions.

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