Affiliation: | 1.Institute for Physics of Microstructures, Russian Academy of Sciences, 603950, Nizhny Novgorod, Russia ;2.Lobachevsky State University of Nizhny Novgorod, 603950, Nizhny Novgorod, Russia ;3.Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia ; |