Long-lived complexes and signatures of chaos in ultracold K2+Rb collisions

Abstract

Lifetimes of complexes formed during ultracold collisions are of current experimental interest as a possible cause of trap loss in ultracold gases of alkali-dimers. Microsecond lifetimes for complexes formed during ultracold elastic collisions of K2 with Rb are reported, from numerically-exact quantum-scattering calculations. The reported lifetimes are compared with those calculated using a simple density-of-states approach, which are shown to be reasonable. Long-lived complexes correspond to narrow scattering resonances which we examine for the statistical signatures of quantum chaos, finding that the positions and widths of the resonances follow the Wigner-Dyson and Porter-Thomas distributions respectively.

7 pages, 5 figures

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Cited by in corpus (18)

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• Loss of ultracold RbCs molecules via optical excitation of long-lived two-body collision complexes
• Bimolecular chemistry in the ultracold regime
• A quasiclassical method for calculating the density of states of ultracold collision complexes
• Ultracold Sticky Collisions: Theoretical and Experimental Status
• Unified model of ultracold molecular collisions
• Resonant control of elastic collisions between ${}^{23}$Na${}^{40}$K molecules and ${}^{40}$K atoms
• Magnetically tunable Feshbach resonances in ultracold gases of europium atoms and mixtures of europium and alkali-metal atoms
• Signatures of Non-universal Quantum Dynamics of Ultracold Chemical Reactions of Polar Alkali-dimer Molecules with Alkali-metal Atoms: Li(${}^2$S) +NaLi($a^3{\Sigma }^{+}$) $\to$ Na(${}^2$S) + Li${}_2$($a^3{\Sigma }_u^{+}$)
• Time delays in ultracold atomic and molecular collisions
• A Model for Scattering with Proliferating Resonances: Many Coupled Square Wells
• The Li + CaF $\to$ Ca + LiF chemical reaction under cold conditions
• Product-state distribution after isotopic substitution in ultracold atom-molecule collisions
• Ultracold collisions of a neutral atom with a trapped ion in 1D
• Lossy Quantum Defect Theory of Ultracold Molecular Collisions
• Universality and threshold laws for collision lifetimes at ultralow temperatures
• Non-adiabatic quantum interference effects and chaoticity in the ultracold Li + LiNa $\to$ Li${}_2$ + Na reaction
• A model for nuclear spin product-state distributions of ultracold chemical reactions in magnetic fields