1. Department of Physics, Xiamen University, Xiamen 361005, China
2. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
3. School of Physics, Southeast University, Nanjing 211189, China
4. National University of Singapore (Suzhou) Research Institute, Suzhou 215123, China