1. School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
2. Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
3. Department of Physics, Yantai University, Yantai 264005, China
4. Shandong Institute of Advanced Technology, Jinan, 250100, China
5. School of Physics & State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China