1. Department of Physics, Faculty of Physics and Electronic Sciences, Hubei University, Wuhan 430062, China
2. School of Physics and Technology, Wuhan University, Wuhan 430072, China
3. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
4. Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering, Changsha University of Science and Technology, Changsha 410114, China