[1] Sungkyunkwan Univ, SSGC, Dept Elect & Elect Engn, Suwon 440746, Gyeonggi Do, South Korea
[2] Samsung Adv Inst Technol, Suwon 443803, Gyeonggi Do, South Korea
[3] Sungkyunkwan Univ, Dept Phys, Dept Energy Sci, Inst Basic Sci, Suwon 440749, Gyeonggi Do, South Korea
[4] Sungkyunkwan Univ, IBS, Ctr Integrated Nanostruct Phys CINAP, Suwon 440749, Gyeonggi Do, South Korea