1. State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130012, China
2. Department of Physics and Materials Science and Centre for Functional Photonics, City University of Hong Kong, Kowloon, Hong Kong SAR
3. State Key Laboratory of Superhard Materials and College of Physics, Jilin University, Changchun, Jilin 130012, China
4. College of Material Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
5. Department of Chemistry and Physics, Louisiana State University, Shreveport, Louisiana 71115, United States