1. School of Computer Science, University of Manchester, Manchester M13 9PL, United Kingdom, School of Physics & Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom, Graphene Industries Limited, 32 Holden Avenue, Whalley Range, Manchester M16 8TA, United Kingdom, Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, United Kingdom, and Institute for Microelectronics Technology, 142432 Chernogolovka, Russia