1. Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
2. University of Science and Technology of China, Hefei 230026, China
3. Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
4. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China