1. School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450007, China
2. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China
3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4. School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China
5. Materials Research Lab at Songshan Lake, Dongguan 523808, China