1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China
2. College of Science, Dalian Minzu University, Dalian 116600, China
3. School of Ocean Science and Technology, Dalian University of Technology, Panjin Campus, Panjin 124221, China
4. Department of Mathematics and Physics, Hohai University, Changzhou 213022, China