1. Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute
2. Drexel University
3. Philadelphia, USA
4. Department of Applied Physics and Applied Mathematics
5. Columbia University
6. New York, USA
7. College of Materials Science and Engineering
8. Nanjing Tech University
9. Nanjing 210009, China
10. Condensed Matter Physics and Materials Science Department
11. Brookhaven National Laboratory