1. Department of Semiconductor Science, Dongguk University-Seoul, Seoul 04620, Republic of Korea
2. Quantum-Functional Semiconductor Research Center, Dongguk University-Seoul, Seoul 04620, Republic of Korea
3. Department of Electronic Engineering, Gachon University, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
4. Gachon Advanced Institute of Semiconductor Technology, Gachon University, Seongnam-si, Gyeonggi-do 13120, Republic of Korea