Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 12: Ultra-cold atoms, ions and BEC

A 12.10: Poster

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

Rydberg atoms in ultracold gases: from electrons to ion impurities — •Marian Rockenhäuser, Thomas Dieterle, Felix Engel, Christian Hölzl, Sophia Ten Huisen, Robert Löw, Tilman Pfau, and Florian Meinert — 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart

We report on our endeavour to exploit Rydberg impurities immersed in degenerate atomic gases for investigating the interaction of the Rydberg electron and the Rydberg core-ion with the quantum gas. Specifically, we have recently demonstrated access to the interaction of the core-ion with the surrounding ground state-atoms at temperatures well below a microkelvin. For this, we suppress the typically dominant electron-neutral interaction by exciting a giant Rydberg atom (n=190) to reach a regime where the Rydberg orbit exceeds the size of the atomic sample by far. Evidence for ion-atom interaction is found in the analysis of the Rydberg excitation spectra. This may allow investigation of charged quantum impurities and associated polaron physics. Further, we make use of a novel two-photon ionisation scheme to create very low-energy ions and study the interaction of a single ion with a single Rydberg atom. By applying high-precision electric fields we control the ion's motion probe the ion induced blockade of a Rydberg excitation for a range of principle quantum numbers. Furthermore, this high level of electric field control can pave the way for controlling cold collisions or studying the chemistry of ultracold hybrid atom-ion systems or charge mobilities in ion-atom mixtures.