1. College of Physical Science and Technology
2. Institute of Optoelectronic Technology
3. Yangzhou University
4. Yangzhou 225002
5. China
6. World Premier International Center for Materials Nanoarchitectonics (WPI-MANA)
7. National Institute for Materials Science (NIMS)
8. Tsukuba 305-0044
9. Japan
10. School of Science
11. Beijing Jiaotong University
12. Beijing
13. P. R. China