1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
2. Max Planck Institute of Microstructure Physics, Halle (Saale) 06120, Germany
3. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
4. Université de Lorraine, CNRS, Institut Jean Lamour, UMR 7198, campus ARTEM, 2 Allée André Guinier, 54011 Nancy, France
5. State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
6. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
7. National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
8. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
9. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China