1. Central Facility Electron Microscopy, Materials Science Electron Microscopy, Ulm University, 89081 Ulm, Germany
2. The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
3. Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
4. Institute of Experimental Physics, Ulm University, 89081 Ulm, Germany