1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, School of Microelectronics, Dalian University of Technology, 2 Ling Gong Road, Dalian 116024, China
2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhong Shan Road, Dalian 116023, China
3. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
4. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China