1. School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China
2. School of Physics and Electronics, Hunan Key Laboratory for Super-micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, China
3. Bremen Center for Computational Materials Science, University of Bremen, Bremen 28359, Germany
4. School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
5. School of Physics and Electronics, Central South University, Changsha 410083, Hunan, P. R. China
6. College of Chemistry and Chemical Engineering, Jishou University, Jishou, Hunan 416000, P. R. China