Affiliation: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea;(2) Advanced Semiconductor Research Center, Division of Electrical and Computer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea;(3) Nano Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea |