Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Ultra-cold plasmas and Rydberg systems

A 11.10: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

Dipole-Dipole blockade in strong fields close to the ionization limit — •Raphael Nold, Lea-Marina Steinert, Sonja Lorenz, Jens Grimmel, József Fórtagh, and Andreas Guenther — CQ center for quantum science, Physikalisches Institut, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen

We have developed a quantum gas microscope based on ionization of atoms and a high resolution ion optics. The system serves as a microscope for ultracold ground state and Rydberg atoms and achieves a magnification up to 1000 with a theoretical resolution limit below 100nm. In our experiments, we focus on the research towards strong correlations between Rydberg atoms in electric fields. We were able to use our high temporal resolution of the ion-microscope to measure the resonant energy transfer at Förster resonances via state selective field ionization. Additionally, we show a direct measurement of the excitation blockade for strongly Stark-shifted Rydberg states close to the classical ionization limit. We developed a detection scheme for controlled ionization in which we excite Rydberg atoms close to an avoided crossings between a weakly and a strongly ionizing state. This allows us to change the ionization rate over three orders of magnitude by applying small changes to the electric field. We investigate the dipole blockade by analyzing the spatial correlations of the excited Rydberg atoms for different values of the initial dipole moment and different dipole-diploe orientations.