Microwave shielding of bosonic NaRb molecules

Abstract

Recent years have witnessed tremendous progresses in creating and manipulating ground-state ultracold polar molecules. However, the two-body loss regardless of the chemical reactivities is still a hurdle for many future explorations. Here, we investigate the loss suppression of non-reactive bosonic ${}^{23}$Na${}^{87}$Rb molecules with a circular polarized microwave blue-detuned to the rotational transition. We achieve suppression of the loss by two orders of magnitude with the lowest two-body loss rate coefficient reduced to $3\times 10^{-12}\mathrm{c}{\mathrm{m}}^3/s$. Meanwhile, the elastic collision rate coefficient is increased to the $10^{-8}\mathrm{c}{\mathrm{m}}^3/s$ level. The large good-to-bad collision ratio has allowed us to carry out evaporative cooling of ${}^{23}$Na${}^{87}$Rb with an efficiency of 1.7(2), increasing the phase-space density by a factor of 10. With further improvements, this technique holds great promises for creating a Bose-Einstein condensate of ultracold polar molecules.

arXiv comment11 pages, 8 figures. Figure 3(c) is updated based on the calculation in Appendix D2. The 1st version was submitted on 17 Apr 2023

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• Diatomic molecules of alkali-metal and alkaline-earth-metal atoms: interaction potentials, dipole moments, and polarizabilities
• Observation of generalized t-J spin dynamics with tunable dipolar interactions
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• Double Microwave Shielding
• SU(N) magnetism with ultracold molecules
• Three-Body Recombination of Ultracold Microwave-Shielded Polar Molecules
• Controlling collisional loss and scattering lengths of ultracold dipolar molecules with static electric fields
• Collisions of Spin-polarized YO Molecules for Single Partial Waves
• A planar cloverleaf antenna for the creation of circularly polarized microwave fields
• Scheme for Deterministic Loading of Laser-Cooled Molecules into Optical Tweezers
• SU($N$) symmetry with ultracold alkali dimers: weak dependence of scattering properties on hyperfine state
• A quantum Monte Carlo based density functional for Dysprosium dipolar system
• Ultracold Interactions between Ions and Polar Molecules
• Dressed-State Spectroscopy and Magic Trapping of Microwave-Shielded NaCs Molecules
• Effective potential and scattering length of shielding polar molecules
• Thermal behavior of Bose-Einstein condensates of polar molecules
• Synthetic Mutual Gauge Field in Microwave-Shielded Polar Molecular Gases
• Dissipative Superfluidity in a Molecular Bose-Einstein Condensate
• Symmetry and Self-Bound Droplets in Dipolar Molecular Gases
• Ground-state selection via many-body superradiant decay
• Ultracold coherent control of molecular collisions at a Förster resonance
• Strongly dipolar molecular Bose-Einstein condensates: From few- to many-body physics
• Delta-Kick Collimation of Heteronuclear Feshbach Molecules
• Efimov Effect in Ultracold Microwave-Shielded Polar Molecules
• High-efficiency loading of 2,400 Ytterbium atoms in optical tweezer arrays