Institution: | a Department of Material Engineering, Optoelectronic Materials, Sungkyunkwan University, 300 ChunChun-Dong, JangAn-Gu, KyungGi-Do, Suwon 440-746, South Korea b Novosibirsk State Tech. University Karl-Marx Av. 20, 630092, Novosibirsk, Russian Federation c Hahn-Meitner-Institut Berlin, Glienicker Str. 100, D-14109, Berlin, Germany d Physics and Chemistry of Solids, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OET, UK e University of Ulsan, San 29, Mugeo-dong, Nam-gu, Ulsan 680-749, South Korea |