1. School of Materials Science and Engineering
2. Xi'an University of Technology
3. Xi'an 710048
4. P. R. China
5. State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics
6. Tsinghua University
7. Beijing
8. China
9. i-Lab
10. Suzhou Institute of Nano-Tech and Nano-Bionics
11. Chinese Academy of Sciences
12. Suzhou
13. Laboratory of Computational Physics
14. Institute of Applied Physics and Computational Mathematics
15. School of Sciences