Group Seminar via Zoom: Rydberg atoms in ultracold gases - from electron to ion impurities

October 13, 2020

Florian Meinert, University of Stuttgart
Group meeting via video conference (Zoom)
Tuesday, October 13th, 09:00 (MEZ)

Dealing with the unique situation of partial lock downs worldwide and home office solutions at our Institute due to the current spreading of the Covid 19 virus, we are now holding our group seminars and journal clubs via video conference. This procedure enables us to continue our research, enhance discussions and exchange important information.


I will report on our endeavor to control single Rydberg atoms immersed in degenerate atomic gases. Such Rydberg impurities allow us to study a rich plethora of effects resulting from the interaction of the Rydberg electron with the surrounding gas such as the formation and structure of ultralong-range Rydberg molecules. More recently, we have demonstrated that a Rydberg impurity can also serve as a precursor to generate a single low-energy ion via tailored photo- or field-ionization schemes. I will discuss how we control the produced ion with small electric fields in the absence of any trapping potentials. This allowed us to observe Rydberg blockade effects induced by a single charge and recently also to study diffusive transport of a single ion through a Bose Einstein condensate [1]. While the dynamics we study here is well captured by semi-classical Langevin collisions, our approach offers intriguing means to enter the elusive quantum regime for ion-atom scattering. In that context, I will finally discuss the status of a new apparatus equipped with a high-resolution ion microscope to study ionic quantum impurities [2].

[1] T. Dieterle, M. Berngruber, C. Hölzl, R. Löw, K. Jachymski, T. Pfau,
    and F. Meinert, arXiv:2007.00309 (2020).

[2] C. Veit, N. Zuber, O. A. Herrera-Sancho, V. S. V. Anasuri, T.
    Schmid, F. Meinert, R. Löw, and T. Pfau, arXiv:2008.08512 (2020).

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