1. Center for Integrated Nanostructure Physics (CINAP) Institute for Basic Science (IBS) Sungkyunkwan University Suwon 16419 Korea
2. Department of Chemistry Sungkyunkwan University Suwon 16419 Korea
3. Artificial Atom and Quantum Materials Center Sungkyunkwan University Suwon 16419 Korea
4. Creative Research Institute Sungkyunkwan University Suwon 16419 Korea
5. Department of Physics & Astronomy and Center for Computational Sciences Mississippi State University Starkville MS 39762 USA
6. Department of Biophysics Sungkyunkwan University Suwon 16419 Korea