1. School of Physics, Xidian University, 710071 Xi'an, China
2. College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, 721016 Baoji, China
3. College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, 721016 Baoji, China
4. School of Information, Guizhou University of Finance and Economics, 550025 Guiyang, China