Affiliation: | 1. Korea Research Institute of Standards and Science, Daejeon, 34113, Republic of Korea;2. Department of Physics, Sook-Myung Women''s University, Seoul, 04310, Republic of Korea;3. Pohang Accelerator Laboratory, POSTECH, Pohang, 37673, Republic of Korea;4. Division of Nano Science, University of Science and Technology, Daejeon, 34113, Republic of Korea |