1. Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communications, School of Physics and Electronic Science, Hunan Institute of Science and Technology, Yueyang 414006, China
2. College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha 410082, China
3. Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology, Beijing 100083, China