1. Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, China
2. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
3. State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China
4. Department of Physics, Beijing Normal University, Beijing 100875, China