1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
2. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
3. College of Physics, Sichuan University, Chengdu 610065, China
4. Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan