1. Department of Electronic and Information Materials Engineering, Division of Advanced Materials Engineering and Research Center of Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea
2. Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea
3. Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
4. Department of Physics, Kunsan National University, Kunsan 54150, Republic of Korea
5. Department of Physics, Kangwon National University, Chuncheon 24341, Republic of Korea