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. Applied Physics and Applied Mathematics Departments
7. Columbia University
8. New York
9. USA
10. State Key Laboratory of New Ceramics and Fine Processing
11. School of Materials Science and Engineering
12. Tsinghua University
13. Beijing 100084
14. Condensed Matter Physics and Materials Science Department
15. Beijing National Laboratory for Condensed Matter Physics
16. Institute of Physics
17. Chinese Academy of Sciences
18. Beijing 100190