1. Department of Physics
2. State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Science (Ministry of Education)
3. Fudan University
4. Shanghai 200433
5. People's Republic of China
6. Department of Microelectronic Science and Engineering Science Faculty of Science
7. Ningbo University
8. Ningbo 315211
9. P. R. China
10. College of Physical Science and Technology
11. Guangxi Normal University
12. 15 Yucai Road
13. Guilin
14. China
15. College of Physics and Electronic Engineering
16. Zhengzhou University of Light Industry
17. Zhengzhou 453002