1. State Key Lab for Superhard
Materials, Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
2. Fundamental Department, Aviation University, Changchun 130022, China
3. Department of Physics, College
of Science, Yanbian University, Yanji,
Jilin 133002, China
4. Department
of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409, United
States