1. Institute of Microelectronics Technology and High-Purity Materials Russian Academy of Sciences, Chernogolovka 142432, Russia
2. Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502, 91405 Orsay Cedex, France
3. Institute for Nanometre Optics and Technology, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein Strasse 15, 12489 Berlin, Germany
4. Nazarbayev University Research and Innovation System, 53 Kabanbay Batyr St., Astana 010000, Kazakhstan