1. Material Research Center, SAIT, Samsung Electronics, Suwon 16678, Republic of Korea
2. Department of Energy Systems Research and Department of Physics, Ajou University, Suwon 16499, Republic of Korea
3. YUHS-KRIBB Medical Convergence Research Institute, Yonsei University, Seoul 03722, Republic of Korea
4. Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
5. Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea