1. School of Physics
2. Southeast University
3. Nanjing 211189
4. China
5. Jiangsu Key Lab on Opto-Electronic Technology
6. School of Physics and Technology
7. Nanjing Normal University
8. Nanjing 210023
9. Department of Electrical and Electronic Engineering
10. South University of Science and Technology of China
11. Shenzhen
12. Department of Physics
13. National University of Singapore
14. Singapore 117542