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A: Fachverband Atomphysik

A 28: Poster Session - Atomic Physics IV

A 28.5: Poster

Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof

Transport of a low-energy ion in a Bose-Einstein condensate. — •Moritz Berngruber, Thomas Dieterle, Felix Engel, Christian Hölzl, Tilman Pfau, and Florian Meinert — 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Stuttgart, Germany

We study the transport properties of a cold ionic impurity in a Bose-Einstein condensate. To this end, we generate a single low-energy ion in an ultra-cold atomic sample starting from a single Rydberg excitation and investigate the interaction between the ionic impurity and the surrounding ground-state atoms. To produce the cold ion, we use methods relying either on a tailored photo-ionization scheme or field ionization. Subsequently the ion is dragged through the Bose-Einstein condensate by applying a weak electric field. Our experiments reveal strong deviations from a bare ballistic motion due to frequent ion-atom collisions and indicate diffusive transport. Furthermore, we discuss the role of three-body recombination on the transport dynamics.