1. School of Materials Science and Engineering
2. University of Science and Technology Beijing
3. Beijing 100083
4. China
5. John A. Paulson School of Engineering and Applied Sciences
6. Harvard University
7. Cambridge
8. Massachusetts 02138
9. USA
10. Beijing Synchrotron Radiation Facility
11. Institute of High Energy Physics
12. Chinese Academy of Sciences
13. Beijing 100049
14. School of Engineering
15. The University of Tokyo
16. Tokyo 1138656
17. Japan
18. National Synchrotron Radiation Laboratory University of Science and Technology of China
19. Hefei