1. College of Physics and Electronic Engineering, Qilu Normal University, Zhangqiu 250200, People’s Republic of China
2. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China
3. School of Information Science and Engineering, Shandong University, Qingdao 266237, People’s Republic of China
4. Department of Physics, Jining University, Qufu 273155, People’s Republic of China