1. Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russian Federation
2. Novosibirsk State University, Novosibirsk 630090, Russian Federation
3. Department of Mechatronic Technology, National Taiwan Normal University, Taipei 106, Taiwan
4. National Chiao Tung University, Hsinchu 300, Taiwan