1. Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China
2. College of Physics, Guizhou University, Guiyang 550025, People's Republic of China
3. NCMIS, LSEC, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China and School of Mathematical Science, University of Chinese Academy of Sciences, Beijing 100190, China