1. Center for Integrated Nanostructure Physics
2. Institute for Basic Science
3. Sungkyunkwan University
4. Suwon 440-746
5. Republic of Korea
6. School of Semiconductor and Chemical Engineering
7. Chonbuk National University
8. Jeonju 561-756
9. Center for Nanocharacterization
10. Korea Research Institute of Standards and Science
11. Daejeon 305-340
12. Korea
13. Department of Advanced Materials Engineering