1. Department of Physics, Jiangsu University of Science and Technology 1 , Zhenjiang 212003, China
2. School of Materials Science and Engineering, Jiangsu University of Science and Technology 2 , Zhenjiang 212003, China
3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University 3 , Beijing 100084, China
4. School of Physics and Materials Engineering, Hefei Normal University 4 , Anhui, Hefei 230601, China
5. College of Mathematics and Physics, Anyang Institute of Technology 5 , Anyang 455000, China