Resonant dipolar collisions of ultracold molecules induced by microwave dressing

Abstract

We demonstrate microwave dressing on ultracold, fermionic ${}^{23}$Na${}^{40}$K ground-state molecules and observe resonant dipolar collisions with cross sections exceeding three times the $s$-wave unitarity limit. The origin of these collisions is the resonant alignment of the approaching molecules' dipoles along the intermolecular axis, which leads to strong attraction. We explain our observations with a conceptually simple two-state picture based on the Condon approximation. Furthermore, we perform coupled-channels calculations that agree well with the experimentally observed collision rates. While collisions are observed here as laser-induced loss, microwave dressing on chemically stable molecules trapped in box potentials may enable the creation of strongly interacting dipolar gases of molecules.

arXiv comment6 pages, 4 figures

References in corpus (45)

• A High Phase-Space-Density Gas of Polar Molecules
• Quantum computation with trapped polar molecules
• Cold and Ultracold Molecules: Science, Technology, and Applications
• A toolbox for lattice spin models with polar molecules
• Realizing a lattice spin model with polar molecules
• Quantum-State Controlled Chemical Reactions of Ultracold KRb Molecules
• Bose-Einstein condensation of atoms in a uniform potential
• Dipolar collisions of polar molecules in the quantum regime
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Creation of an ultracold gas of ground-state ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules
• Quantum gas of rovibronic ground-state molecules in an optical lattice
• Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
• Schemes for robust quantum computation with polar molecules
• Homogeneous Atomic Fermi Gases
• Universal rate constants for reactive collisions of ultracold molecules
• Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
• Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules
• Long-Lived Ultracold Molecules with Electric and Magnetic Dipole Moments
• Observation of magnetically tunable Feshbach resonances in ultracold ${}^{23}$Na${}^{40}$K+${}^{40}$K collisions
• Microwave shielding of ultracold polar molecules
• Quantum phases of a Two-Dimensional Dipolar Fermi Gas
• Second-Scale Nuclear Spin Coherence Time of Trapped Ultracold ${}^{23}$Na${}^{40}$K Molecules
• The hyperfine energy levels of alkali metal dimers: ground-state polar molecules in electric and magnetic fields
• Repulsive shield between polar molecules
• Collisions of ultracold ^{23}Na^{87}Rb molecules with controlled chemical reactivities
• Photo-induced two-body loss of ultracold molecules
• Sticky collisions of ultracold RbCs molecules
• Cold Atoms and Molecules in Self-Assembled Dipolar Lattices
• Controlling the scattering length of ultracold dipolar molecules
• Loss of ultracold RbCs molecules via optical excitation of long-lived two-body collision complexes
• Microwave traps for cold polar molecules
• Modeling the adiabatic creation of ultracold, polar ${}^{23}\mathrm{N}{\mathrm{a}}^{40}\mathrm{K}$ molecules
• Topological p_x+ip_y Superfluid Phase of Fermionic Polar Molecules
• Coherent Microwave Control of Ultracold ${}^{23}$Na${}^{40}$K Molecules
• Quantum reactive scattering of ultracold NH($X{}^3{\Sigma }^{-}$) radicals in a magnetic trap
• Adimensional theory of shielding in ultracold collisions of dipolar rotors
• Dipolar Collisions of Ultracold Ground-state Bosonic Molecules
• Hyperfine structure of alkali-metal diatomic molecules
• Two-Photon Pathway to Ultracold Ground State Molecules of ${}^{23}$Na${}^{40}$K
• The Hyperfine Molecular Hubbard Hamiltonian
• Microwave trap for atoms and molecules
• A high quality, efficiently coupled microwave cavity for trapping cold molecules

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• Collisionally Stable Gas of Bosonic Dipolar Ground State Molecules
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• Seconds-scale coherence on nuclear spin transitions of ultracold polar molecules in 3D optical lattices
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• Dissipative Superfluidity in a Molecular Bose-Einstein Condensate
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• Realizing negative index of refraction in an ensemble of ground-state polar molecules with lasers
• Microwave-assisted coherent control of ultracold polar molecules with a ladder-type rotational states
• Optical lattice quantum simulator of dynamics beyond Born-Oppenheimer
• Lossy Quantum Defect Theory of Ultracold Molecular Collisions
• Competition of light- and phonon-dressing in microwave-dressed Bose polarons