1. State Key Laboratory of Superhard Materials
2. Jilin University
3. Changchun 130012, China
4. College of Physics
5. Beihua University
6. Material Science and Nanoengineering
7. Rice University
8. Houston, USA
9. Department of Physics and Engineering Physics
10. University of Saskatchewan
11. Saskatoon, Canada
12. Geophysical Laboratory
13. Carnegie Institution of Washington