1. Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev aven., Novosibirsk 630090, Russia
2. Novosibirsk State Technical University, 20 K. Marx str., Novosibirsk 630073, Russia
3. Physical Department, Novosibirsk State University, 1 Pirogov str., Novosibirsk 630090, Russia
4. Institute of Physics and Technologies, North-Eastern Federal University, 58 Belinsky str., Yakutsk 677027, Russia