1. Moscow Institute of Physics and Technology, State University, 9 Institutskiy per., Dolgoprudny, Moscow Region 141700, Russia
2. National University of Science and Technology MISIS, 4 Leninsky Prosp., Moscow 119049, Russia
3. Institute of Solid State Physics (ISSP RAS), Chernogolovka, 142432 Moscow Region, Russia
4. Solid State Physics Department, Kazan Federal University, 420008 Kazan, Russia
5. Fundamental Physical and Chemical Engineering Department, MSU, 119991 Moscow, Russia
6. National Research Nuclear University MEPhI, 31 Kashirskoye sh., 115409 Moscow, Russia
7. Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
8. Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany