1. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
2. University of Science and Technology of China, Hefei 230026, China
3. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China
4. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China