1. School of Electrical Engineering Korea University 145, Anam‐ro, Seongbuk‐gu Seoul 02841 Korea
2. Department of Semiconductor Systems Engineering Korea University 145, Anam‐ro, Seongbuk‐gu Seoul 02841 Korea
3. Department of Nano Semiconductor Engineering Korea University 145, Anam‐ro, Seongbuk‐gu Seoul 02841 Korea