1. Shubnikov Institute of Crystallography Federal Scientific Research Center Crystallography and Photonics Russian Academy of Sciences 59 Leninskii Prospect Moscow 119333 Russia
2. Skolkovo Institute of Science and Technology Skolkovo Innovation Center 3 Nobel Street Moscow 121025 Russia
3. P.N. Lebedev Physical Institute Russian Academy of Sciences Moscow 119991 Russia
4. National Research University Higher School of Economics Moscow 101000 Russia
5. Center for Advanced Radiation Sources The University of Chicago 5640 South Ellis Avenue Chicago IL 60637 USA
6. Institute for Nuclear Research Russian Academy of Sciences Fizicheskaya str. 27, Troitsk Moscow 108840 Russia
7. Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China
8. Centro de Física de Materiales CFM CSIC‐UPV/EHU Paseo Manuel de Lardizabal 5, Basque Country Donostia 20018 Spain
9. Departamento de Física de la Materia Condensada University of the Basque Country (UPV/EHU) Basque Country Bilbao 48080 Spain
10. Donostia International Physics Center (DIPC) Manuel Lardizabal pasealekua 4, Basque Country Donostia 20018 Spain
11. Fisika Aplikatua 1 Saila University of the Basque Country (UPV/EHU) Europa plaza 1 Donostia 20018 Spain
12. Departimento di Fisica Università di Trento Via Sommarive 14 Povo 38123 Italy
13. Sorbonne Université CNRS Institut des Nanosciences de Paris UMR7588 Paris F‐75252 France
14. Graphene Labs Fondazione Istituto Italiano di Tecnologia Via Morego Genova I‐16163 Italy
15. Dipartimento di Fisica Università di Roma Sapienza Piazzale Aldo Moro 5 Roma I‐00185 Italy
16. Department of Physics University of Tokyo 7‐3‐1 Hongo Bunkyo Tokyo 113‐8654 Japan