1. Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China
2. International Centre of Quantum and Molecular Structures, Department of Physics, Shanghai University, Shanghai 200444, China
3. Department of Physics, University at Buffalo, State University of New York, Buffalo, New York 14260, USA
4. Center for Computational Materials, Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, USA
5. Key Laboratory of Material Modification by Laser, Ion, and Electron Beams, Dalian University of Technology, Ministry of Education, Dalian 116024, China