1. Jiangsu Key Laboratory of Artificial Functional Materials & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
2. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
3. Department of Physics, Nanjing University, Nanjing 210093, China
4. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei 230031, Anhui, China
5. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China