1. School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People’s Republic of China
2. Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong 999077, People’s Republic of China
3. School of Physics, Shandong University, Jinan 250100, People’s Republic of China
4. Department of Physics, Jining University, Qufu 273155, People’s Republic of China