1. Department of Nanophotonics Korea University 145 Anam‐ro, Seongbuk‐gu Seoul 02841 Republic of Korea
2. Department of Materials Science and Engineering Korea University 145 Anam‐ro, Seongbuk‐gu Seoul 02841 Republic of Korea
3. Center for Neuromorphic Engineering Korea Institute of Science and Technology (KIST) 5, Hwarang‐ro 14‐gil, Seongbuk‐gu Seoul 02792 Republic of Korea