1. National-Provincial Laboratory of Special Function Thin Film Materials, School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
2. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
3. Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials, School of Physics and Electronics, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
4. School of Physics, Sun Yat-sen University, Guangzhou, Guangdong 510275, China