1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China
2. University of Science and Technology of China, Hefei 230026, China
3. Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Shanghai, 201203, China
4. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynská Dolina F2, 842 48 Bratislava, Slovakia
5. School of Physics and Astronomy and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, U.K.
6. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
7. Istituto Nazionale di Ottica (CNR-INO) and European Laboratory for non Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto Fiorentino, Italy