Preparation of quasi-two-dimensional Bose mixture of ultracold ${}^{23}$Na and ${}^{87}$Rb atoms

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 ${}^{23}$Na and ${}^{87}$Rb. 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.

13 pages, 9 figures in total. To be published in Physical Review A

References in corpus (30)

• Many-Body Physics with Ultracold Gases
• Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
• Quantum liquid droplets in a mixture of Bose-Einstein condensates
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Feshbach resonances in rubidium 87: Precision measurement and analysis
• Observation of scale invariance and universality in two-dimensional Bose gases
• Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
• Observation of Efimov Resonances in a Mixture with Extreme Mass Imbalance
• Evaporation of microwave-shielded polar molecules to quantum degeneracy
• Observation of Bose-Einstein Condensation of Dipolar Molecules
• Repulsive shield between polar molecules
• Dipolar evaporation of reactive molecules to below the Fermi temperature
• Observation of a Lee-Huang-Yang Fluid
• Universal Properties of Two-Dimensional Boson Droplets
• Kosterlitz-Thouless transition of the quasi two-dimensional trapped Bose gas
• Realization of a Townes soliton in a two-component planar Bose gas
• Expansion dynamics of a shell-shaped Bose-Einstein condensate
• Quantum mixtures of ultracold gases of neutral atoms
• Semiclassical theory of the quasi two-dimensional trapped Bose gas
• Mixed bubbles in Bose-Bose mixtures
• Observation of the Hanbury Brown and Twiss Effect with Ultracold Molecules
• Coupled superfluidity of binary Bose mixtures in two dimensions
• Overlapping Bose-Einstein Condensates of ${}^{23}$Na and ${}^{133}$Cs
• Lattice polarons across the superfluid to Mott insulator transition
• Feshbach Loss Spectroscopy in an Ultracold ${}^{23}$Na and ${}^{40}$K Mixture
• Analysis of the Holzmann-Chevallier-Krauth theory for the trapped quasi-two-dimensional Bose gas
• Improved characterization of Feshbach resonances and interaction potentials between ${}^{23}$Na and ${}^{87}$Rb atoms
• Finite temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture
• Quantum droplets in two-dimensional Bose mixtures at finite temperature