1. Center of Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
2. Institute of Physics and Applied Physics, Yonsei University, Seoul 03722, Republic of Korea
3. Quantum-Functional Semiconductor Research Center, Dongguk University, Seoul 04620, Republic of Korea
4. Jeonju Center, Korea Basic Science Institute, Jeonju, Jeonbuk 54907, Republic of Korea
5. Advanced Analysis Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
6. Division of Nano & Information Technology, KIST School, University of Science and Technology (UST), Seoul 02792, Republic of Korea