1. School of Physics and Electronics
2. Shandong Normal University
3. Jinan
4. China
5. Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science
6. School of Mathematics and Physics
7. University of Science and Technology Beijing
8. Beijing
9. P. R. China
10. Beijing National Laboratory for Condensed Matter Physics
11. Institute of Physics
12. Chinese Academy of Sciences
13. Department of Physics
14. Liaoning University
15. Shenyang 110036