Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Quantengase: Optische Gitter 2
Q 27.2: Talk
Tuesday, March 13, 2012, 14:15–14:30, V53.01
An Ultracold Gas doped with few and single Impurity Atoms — •Nicolas Spethmann1, Farina Kindermann2,1, Dieter Meschede1, and Artur Widera2,1 — 1Institut für angewandte Physik, Wegelerstr. 8, 53115 Bonn — 2TU Kaiserslautern, FB Physik, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern
Ultracold gases doped with impurity atoms are promising hybrid systems that pave the way for the realization of intriguing scenarios,such as studying polaron physics,forming local, coherent probes for a many-body system, coherent cooling of individual neutral atoms containing quantum information. Here, we immerse single and few Cs atoms into an ultracold Rb cloud. The sympathetic cooling of the impurity atoms is observed, where the temperature is limited only by the temperature of the Rb gas. The thermalization dynamics is analyzed to deduce the elastic interspecies scattering length. Inelastic three-body collisions are studied atom-by-atom and event-by-event, allowing to unambiguously assign losses to Rb-Rb-Cs three-body recombination. In all experiments, the ultracold Rb gas remains unaff*ected by the interaction with the Cs impurity atoms, demonstrating the feasability of using single atoms as probes for a many-body system.