Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.8: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Interaction Effects and Collisional Processes in Mesoscopic Rydberg Driven Ensembles — •Torsten Manthey, Thomas Niederprüm, Oliver Thomas, Tobias M. Weber, and Herwig Ott — Universität Kaiserslautern

We study the longtime behavior of ultracold mesoscopic atomic ensembles excited to Rydberg P-states. To this purpose, we use a scanning electron microscope to tailor arbitrary density distributions and an ultraviolet laser beam to excite Rydberg atoms. This allows for the investigation of interaction effects between multiple Rydberg atoms as well as a Rydberg atom and a ground state atom. In this context, we have created an isolated ultracold atomic 87Rb ensemble spatially confined in the blockade volume of a Rydberg atom, a so-called superatom. In this volume only one Rydberg excitation is possible as a result of the Rydberg blockade, where all other atoms are shifted out of resonance due to the strong dipole dipole interaction. Furthermore we can study the creation of molecular ions, produced by a transport mechanism based on the scattering of the Rydberg electron with a ground state atom and the interaction of this atom with the ionic core. Finally we show that the presence of an electron beam during the excitation of atoms into Rydberg states has a massive effect on the excitation probability, which is due to l-changing collisions of the Rydberg atoms with the electron beam.probability, which is due to l-changing collisions of the Rydberg atoms with the electron beam.