1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. School
of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3. International
Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
4. Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, Singapore 637371
5. Department
of Physics, Shaanxi University of Science and Technology, Xi’an 710021, China
6. Beijing
Institute of Nanoenery and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST) Beijing 100083, China
7. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China
8. Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China