Institution: | a Imec, Kapeldreef 75, 3001 Leuven, Belgium b Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan c Research Fellow of Japan Society for the Promotion of Science, Japan d Instituut voor Kern-en Stralingsfysica and INPAC, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium |