1. Laboratoire
des Matériaux Semiconducteurs, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
2. St. Petersburg Academic University, Khlopina 8/3, 194021 St. Petersburg, Russia
3. Ioffe Physical Technical Institute of the Russian Academy of Sciences, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
4. ITMO University, Kronverkskiy
pr. 49, 197101 St.
Petersburg, Russia