1. Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, China
2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3. Xiamen University, Xiamen 361005, Fujian, China
4. University of Science and Technology, Beijing 100083, China
5. Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, China