Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 31: Poster Session III

A 31.34: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG1

Ion microscopy of ultracold ground state and Rydberg atoms — •Markus Stecker, Jens Grimmel, Raphael Nold, Andreas Günther, and József Fortágh — Center for Quantum Science, Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Germany

We developed a novel quantum gas microscope based on ionization of atoms and high resolution ion optics. The system achieves a magnification up to 1000 and a theoretical resolution limit below 100nm. The microscope consists of four electrostatic lenses and a microchannel plate in conjunction with a delay line detector. This allows the observation of ultracold ground state as well as Rydberg atoms with single atom sensitivity and high temporal and spatial resolution.

We show the ion-optical setup and its experimental implementation to an ultra-cold atom setup. We investigated its performance by spatially patterned ionization of ground state atoms out of a magneto-optical trap. Furthermore, we present excitation and detection of Rydberg atoms. We studied the Stark effect on Rydberg atoms in different electric field ranges. At high fields, we measured the spectra of highly Stark-shifted Rydberg resonances and compared these findings to a newly developed numerical calculation including ionization rates. In the low field region, we investigated Förster resonances and their influence on the excitation statistics.