1. Department
of Materials Science and Engineering and Key Laboratory of Automobile
Materials of MOE, Jilin University, Changchun 130012, China
2. Department
of Materials Science and Nanoengineering, Rice University, Houston, Texas 77005, United States
3. Department
of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States
4. Beijing Computational Science Research Center, Beijing 100094, China
5. State
Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China