1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People’s Republic of China
2. School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, People’s Republic of China
3. School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People’s Republic of China
4. School of Physical Science and Technology, Ningbo University, Ningbo 315211, People’s Republic of China