1. Beijing Synchrotron Radiation
Facility,
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2. Department
of Physics, South China University of Technology, Guangzhou 510640, China
3. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
4. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China