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Observation of collisions between cold Li atoms and Yb$^+$ ions (1707.01729v2)

Published 6 Jul 2017 in physics.atom-ph

Abstract: We report on the observation of cold collisions between $6$Li atoms and Yb$+$ ions. This combination of species has recently been proposed as the most suitable for reaching the quantum limit in hybrid atom-ion systems, due to its large mass ratio. For atoms and ions prepared in the $2S_{1/2}$ ground state, the charge transfer and association rate is found to be at least~10${3}$ times smaller than the Langevin collision rate. These results confirm the excellent prospects of $6$Li--Yb$+$ for sympathetic cooling and quantum information applications. For ions prepared in the excited electronic states $2P_{1/2}$, $2D_{3/2}$ and $2F_{7/2}$, we find that the reaction rate is dominated by charge transfer and does not depend on the ionic isotope nor the collision energy in the range $\sim$~1--120~mK. The low charge transfer rate for ground state collisions is corroborated by theory, but the $4f$ shell in the Yb$+$ ion prevents an accurate prediction for the charge transfer rate of the $2P_{1/2}$, $2D_{3/2}$ and $2F_{7/2}$ states. Using \textit{ab initio} methods of quantum chemistry we calculate the atom-ion interaction potentials up to energies of 30$\times 103$~cm${-1}$, and use these to give qualitative explanations of the observed rates.

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