1. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Beijing Key Laboratory for Advanced Functional Materials and Structure Research Beijing 100190 China
4. Songshan Materials Laboratory Guangdong Dongguan 523808 China
5. Department of Applied Physics Aalto University School of Science Espoo FI‐00076 Finland