1. State Key Lab of Superhard Materials
2. College of Physics
3. Jilin University
4. Changchun 130012
5. China
6. Department of Mechanical Engineering
7. The University of Hong Kong
8. Hong Kong SAR
9. Department of Physics
10. College of Science
11. Yanbian University
12. Yanji 133002
13. School of Physics and Electronic Engineering
14. Jiangsu Normal University
15. Xuzhou 221116
16. Department of Chemistry
17. University of Puerto Rico
18. Rio Piedras Campus
19. San Juan
20. USA