1. Rzhanov Institute of Semiconductor Physics (SBRAS), Lavrentjev av. 13, Novosibirsk, 630090, Russia
2. Novosibirsk State University, Pirogov str. 1, Novosibirsk 630090, Russia
3. Semiconductor Physics and Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, Reichenhainer Str. 70, D-09107, Chemnitz, Germany