Nicolas Spethmann, Farina Kindermann, Shincy John, Claudia Weber, Dieter Meschede, Artur Widera
We report on controlled doping of an ultracold Rb gas with single neutral Cs impurity atoms. We study elastic as well as inelastic collisions between the impurity atom and atoms of the Rb gas with single atom resolution. Following the thermalization of initially laser cooled impurity atoms to the temperature of the ultracold Rb gas allows us to estimate a lower limit of the elastic interspecies s-wave scattering length. Inelastic interactions are restricted to three-body recombination, which we observe event-by-event with atomic resolution and determine the Rb-Rb-Cs three-body loss rate. Our results pave the way for a coherently interacting hybrid system of individually controllable impurities in a quantum many-body system.
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http://arxiv.org/abs/1204.6051
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