1. Center for Nanotechnology Innovation @NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro 12, I-56127 Pisa, Italy
2. NEST, Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy
3. Central Facility for Electron Microscopy, Materials Science Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
4. MAX IV Laboratory, Lund University, P.O. Box 118, Lund, S-22100, Sweden
5. Graphene Laboratories, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
6. Department of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Italy
7. Institut des Nanosciences de Paris, UMR7588, Sorbonne Université, CNRS, F-75252 Paris, France