Affiliation: | 1. Frontier Research Lab, Samsung Advanced Institute of Technology (SAIT), P. O. Box 111, Suwon 440‐600, Korea;2. BK21 Physics Division, Department of Energy Science and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440‐746, Korea |