1. Karlsruhe Institute of Technology (KIT), Laboratory for Electron Microscopy (LEM), Karlsruhe, Germany
2. Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP), Eggenstein-Leopoldshafen, Germany
3. University of Geneva, Department of Quantum Matter Physics (DQMP), Quai Ernest-Ansermet 24, 1211 Geneva, Switzerland