1. Department
of Nano Science and Mechanical Engineering and Nanotechnology Research
Center, Konkuk University, Chungju, Chungbuk 380-701, Republic of Korea
2. Department
of Physics, Tohoku University, Sendai 980-8578, Japan
3. Department
of Chemistry, POSTECH, Pohang 790-784, Republic of Korea
4. Beijing
National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
5. Center for Integrated
Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
6. Department
of Physics, University of Florida, Gainesville, Florida 32611, United States
7. Quantum
Optics Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea
8. Nanosystem
Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8562, Japan