Affiliation: | 1.St. Petersburg State Polytechnical University, Polytechnicheskaya 29, St. Petersburg, 195251, Russia;2.Ioffe Physical Technical Institute of the Russian Academy of Sciences, Polytechnicheskaya 26, St. Petersburg, 194021, Russia;3.University of Eastern Finland, Yliopistokatu 7, P. O. Box 111, Joensuu, 80101, Finland;4.St. Petersburg Academic University - Nanotechnology Research and Education Centre of the Russian Academy of Sciences, Khlopina 8/3, St. Petersburg, 195220, Russia |