1. Department of Physics
2. City University of Hong Kong
3. Kowloon
4. Hong Kong
5. Department of Materials Science and Engineering, Northwestern University
6. Evanston
7. USA
8. Department of Electrical and Computer Engineering
9. University of California
10. Davis
11. Department of Applied Physics
12. The Hong Kong Polytechnic University
13. Hung Hom
14. Department of Materials Science and Engineering