1. State Key Laboratory of Information Photonics and Optical Communications
2. School of Science
3. Beijing University of Posts and Telecommunications
4. Beijing 100876
5. China
6. Shenzhen Key Laboratory of Laser Engineering
7. College of Optoelectronic Engineering
8. Shenzhen University
9. Shenzhen 518060
10. University Research Facility in Materials Characterization and Device Fabrication
11. Hong Kong Polytechnic University
12. Kowloon
13. Hong Kong
14. Beijing National Laboratory for Condensed Matter Physics
15. Institute of Physics
16. Chinese Academy of Sciences
17. Beijing 100190