1. College of Science, China Agricultural University, Beijing 100083, People's Republic of China
2. College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, People's Republic of China
3. School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
4. Department of Physics, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
5. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, People's Republic of China
6. Institute for Theoretical Physics I, Ruhr University, D-44801 Bochum, Germany