1. Department of Physics, School of Physics and Astronomy, Yunnan University, Kunming 650500, China
2. Key Laboratory of Yunnan Provincial Higher Education Institutions for Optoelectronics Device Engineering, School of Physics and Astronomy, Yunnan University, Kunming 650500, China
3. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China
4. Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450046, China
5. Department of Physics, Mathematics and Computer Science, Faculty of Basic Medical Science, Kunming Medical University, Kunming 650500, China
6. Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada