1. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Physics, Nanjing University, Nanjing 210093, China
2. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
3. Department of Physics, National University of Defense Technology, Changsha 410073, China
4. Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China
5. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
6. School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
7. Division of Nanophotonics, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
8. Songshan Lake Materials Laboratory, Dongguan 523808, China