Universalities in ultracold reactions of alkali polar molecules

Abstract

We consider ultracold collisions of ground-state, heteronuclear alkali dimers that are susceptible to four-center chemical reactions 2 AB -> A2 + B2 even at sub-microKelvin temperature. These reactions depend strongly on species, temperature, electric field, and confinement in an optical lattice. We calculate ab initio van der Walls coefficients for these interactions, and use a quantum formalism to study the scattering properties of such molecules under an external electric field and optical lattice. We also apply a quantum threshold model to explore the dependence of reaction rates on the various parameters. We find that, among the heteronuclear alkali fermionic species, LiNa is the least reactive, whereas LiCs is the most reactive. For the bosonic species, LiK is the most reactive in zero field, but all species considered - LiNa, LiK, LiRb, LiCs, and KRb - share a universal reaction rate once a sufficiently high electric field is applied.

12 pages, 9 figures

References in corpus (24)

• A High Phase-Space-Density Gas of Polar Molecules
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
• Schemes for robust quantum computation with polar molecules
• Ultracold dense gas of deeply bound heteronuclear molecules
• Reactions of ultracold alkali metal dimers
• Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
• Quantum Magnetism with Polar Alkali Dimers
• Calculations of static dipole polarizabilities of alkali dimers. Prospects for alignment of ultracold molecules
• Inelastic collisions of ultra-cold heteronuclear molecules in an optical trap
• Production of a dual-species Bose-Einstein condensate of Rb and Cs atoms
• Universal rates for reactive ultracold polar molecules in reduced dimensions
• Strong dependence of ultracold chemical rates on electric dipole moments
• Universal ultracold collision rates for polar molecules of two alkali-metal atoms
• Universal model for exoergic bimolecular reactions and inelastic processes
• Molecular spectroscopy for ground-state transfer of ultracold RbCs molecules
• Dynamics of ultracold molecules in confined geometry and electric field
• Electric field suppression of ultracold confined chemical rates
• The Efimov effect for three interacting bosonic dipoles
• Quantum Langevin model for exoergic ion-molecule reactions and inelastic processes
• A high phase-space density mixture of ${}^{87}$Rb and ${}^{133}$Cs: towards ultracold heteronuclear molecules
• Chemical pathways in ultracold reactions of SrF molecules
• Population redistribution in optically trapped polar molecules
• Comparative study of the rovibrational properties of heteronuclear alkali dimers in electric fields

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• Dipolar Collisions of Ultracold Ground-state Bosonic Molecules
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• Few-body physics of ultracold atoms and molecules with long-range interactions
• Electric field dependence of complex-dominated ultracold molecular collisions
• Spin Squeezing with Itinerant Dipoles: A Case for Shallow Lattices
• A Comparative Analysis of Non-relativistic and Relativistic Calculations of Electric Dipole Moments and Polarizabilities of Heteronuclear Alkali Dimers
• Ultracold collisions of molecules
• Long-range interactions between ultracold atoms and molecules
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses