1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
4. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
5. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China