1. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Pudong, Shanghai 201203, People's Republic of China
2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
3. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, People's Republic of China
4. School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
5. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
6. Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA