Division of Physics and Semiconductor Science;
Dongguk University;
Seoul 04620;
Republic of Korea;
Department of Radiation Oncology;
Asan Medical Center;
Seoul 05505;
Republic of Korea;
Department of Energy and Materials Engineering;
Dongguk University;
Seoul 04620;
Republic of Korea;
Department of Physics;
Sungkyunkwan University;
Suwon 2066;
Republic of Korea;
Department of Bionano Technology and Department of Applied Chemistry;
Hanyang University;
Ansan 15588;
Republic of Korea;