1. Research
Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
2. Department
of Applied Physics, Key Laboratory of Micro-nano Measurement-Manipulation
and Physics (Ministry of Education), Beihang University, Beijing 100191, China
3. School
of Physics and Technology, Wuhan University, Wuhan 430072, China
4. Beijing
National Laboratory for Condensed Matter Physics, and Institute of
Physics, Chinese Academy of Sciences, Beijing 100190, China
5. Collaborative Innovation Center of Quantum Matter, Beijing, China