1. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
4. Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
5. AnalyticalInstrumentation Center, School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
6. Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom