1. Ningxia Key Laboratory of Photovoltaic Materials, Ningxia University, Yinchuan, Ningxia 750021, P.R. China
2. Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China
3. School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
4. Department of Physics and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
5. Collaborative Innovation Center of Quantum Matter, Beijing 100871, P.R. China