1. School of Mathematics and Physics, Anhui University of Technology, Maanshan 243000, China
2. Key Laboratory of Functional Molecular Solids, Ministry of Education and College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
3. Analysis and Testing central Facility, Anhui University of Technology, Maanshan 243000, China
4. Physics Experiment Teaching Center, School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China