1. Key Laboratory for Renewable Energy (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China
2. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
5. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, PR China
6. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China