1. College of Science, Guilin University of Technology, Guilin 541004, People’s Republic of China
2. Key Laboratory of Low-dimensional Structural Physics and Application, Education Department of Guangxi Zhuang Autonomous Region, Guilin University of Technology, Guilin 541004, People’s Republic of China
3. School of Physics, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
4. Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Fujian Key Laboratory of Photoelectric Functional Materials, College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, People’s Republic of China
5. Key Lab of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education, School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, People’s Republic of China