1. International
Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
2. Beijing
Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
3. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
4. State
Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
5. High
Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
6. Department
of Physics, Beijing Normal University, Beijing 100875, China