1. Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece
2. Department of Informatics, Center for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki, Thessaloniki 57001, Greece
3. AMO GmbH, Advanced Microelectronic Center Aachen (AMICA), Otto-Blumenthal-Strasse 25, Aachen 52074, Germany
4. ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona 08860, Spain
5. ICREA - Institució Catalana de Recerca i Estudis Avançats, Barcelona 08010, Spain
6. Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA, U.K.
7. University Research Center of Ioannina (URCI), Institute of Materials Science and Computing, Ioannina 45110, Greece