1. School of Information Science and Technology
2. Northwest University
3. Xi'an
4. China
5. School of Physics
6. State Key Laboratory of Crystal Materials
7. Shandong University
8. Jinan 250100
9. State Key Laboratory of Superhard Materials
10. Jilin University
11. Changchun
12. Department of Physics and Engineering Physics
13. The University of Tulsa
14. Tulsa
15. USA