1. WCU Department of Energy Science
2. Sungkyunkwan University
3. Suwon 440-746, Republic of Korea
4. Department of Electrical Engineering
5. University of California Los Angeles
6. CA 90095, USA
7. BK21 Department of Physics
8. Laboratoire Interdisciplinaire Carnot de Bourgogne
9. CNRS-UMR 6303
10. Université de Bourgogne
11. Dijon 21078, France
12. School of Electronic & Electrical Engineering
13. College of Information & Communication Engineering and SKKU Advanced Institute of Nanotechnology