1. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
2. Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments (MFree), Institute for Shanghai Advanced Research in Physical Sciences (SHARPS), Shanghai 201203, China
3. State Key Laboratory of Superhard Materials, Institute of Physics, Jilin University, Changchun 130012, China
4. Multi-Discipline Research Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
5. Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
6. Department of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, USA