1. Technical University of Munich, TUM School of Natural Sciences Department of Physics Chair for Functional Materials James‐Franck‐Str. 1 85748 Garching Germany
2. Chair for Photonics and Optoelectronics Nano‐Institute Munich, Department of Physics Ludwig‐Maximilians‐University Munich Königinstr. 10 80539 Munich Germany
3. Department Chemie und CeNS Ludwig‐Maximilians‐Universität München Butenandtstr. 11 81377 München Germany
4. Technical University of Munich Heinz Maier‐Leibnitz Zentrum (MLZ) Lichtenbergstraße 1 85748 Garching Germany