1. Department of Physics Freie Universität Berlin Arnimallee 14 14195 Berlin Germany
2. Department of Physical Chemistry Fritz Haber Institute of the Max Planck Society Faradayweg 4–6 14195 Berlin Germany
3. Faculty of Mathematics and Physics Charles University Ke Karlovu 2027/3 Prague 12116 Czech Republic
4. School of Physics University of Bristol Tyndall Avenue Bristol BS8 1TL UK
5. Institut für Physik Johannes‐Gutenberg‐Universität Mainz Staudingerweg 7 55128 Mainz Germany
6. Department of Materials ETH Zürich Hönggerbergring 64 Zürich 8093 Switzerland
7. Singulus Technologies AG 63796 Kahl am Main Germany
8. Institut für Physik Martin‐Luther‐Universität Halle Von‐Danckelmann‐Platz 06120 Halle Germany