Affiliation: | 1.Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia ;2.Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia ;3.ITMO University, St. Petersburg, 197101, Russia ;4.Department of Physics, University of Oslo, P. O. Box 1048, Blindern, Oslo, 0316, Norway ; |