1. Laboratoire National
des Champs Magnetiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25 Rue des Martyrs, 38042 Grenoble, France
2. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
3. School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
4. National Graphene Institute, University of Manchester, Oxford
Road, Manchester, M13 9PL, United Kingdom
5. National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
6. Manchester
Centre for Mesoscience and Nanotechnology, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom