1. Department of Physics, South China University of Technology, Guangzhou 510640, China
2. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
3. Center for Photovoltaics and Solar Energy, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
4. Beijing Computational Science Research Center, Beijing 100084, China
5. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA