1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
2. University of Science and Technology of China, Hefei 230029, People's Republic of China
3. Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China
4. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China