First ab initio potentials, transition dipoles, and scattering rates for Al+ with Rb and Sr predict slow radiative charge transfer and molecular ion formation, with branching ratios favoring the ground molecular state.
Buffer gas cooling of a trapped ion to the quantum regime
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abstract
Great advances in precision quantum measurement have been achieved with trapped ions and atomic gases at the lowest possible temperatures. These successes have inspired ideas to merge the two systems. In this way one can study the unique properties of ionic impurities inside a quantum fluid or explore buffer gas cooling of the trapped ion quantum computer. Remarkably, in spite of its importance, experiments with atom-ion mixtures remained firmly confined to the classical collision regime. We report a collision energy of 1.15(0.23) times the $s$-wave energy (or 9.9(2.0)~$\mu$K) for a trapped ytterbium ion in an ultracold lithium gas. We observed a deviation from classical Langevin theory by studying the spin-exchange dynamics, indicating quantum behavior in the atom-ion collisions. Our results open up numerous opportunities, such as the exploration of atom-ion Feshbach resonances, in analogy to neutral systems.
fields
physics.atom-ph 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Interactions and charge transfer dynamics of an Al$^+$ ion immersed in ultracold Rb and Sr atoms
First ab initio potentials, transition dipoles, and scattering rates for Al+ with Rb and Sr predict slow radiative charge transfer and molecular ion formation, with branching ratios favoring the ground molecular state.