1. School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, Anhui 230009, People’s Republic of China
2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
3. Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, People’s Republic of China