1. St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia
2. Ioffe Physical Technical Institute, St.
Petersburg, 194021, Russia
3. ITMO University, St. Petersburg, 197101, Russia
4. Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
5. II Physikalisches
Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
6. M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, 199991 Moscow, Russia
7. Departamento
de Fisica de Materiales and CFM-MPC UPV/EHU, Donostia International Physics Center (DIPC), 20080 San Sebastian, Spain
8. Tomsk State University, Lenina Avenue,
36, 634050 Tomsk, Russia
9. Institut für Festkörperphysik, Karlsruher Institut für Technologie, D-76021 Karlsruhe, Germany
10. Institute of Strength Physics and Materials Science, pr. Academicheskii 2/1, 634021, Tomsk, Russian Federation
11. Institute
of Solid State Physics, Dresden University of Technology, 01062 Dresden, Germany
12. IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain