1. Electrical and Electronic Engineering and Information Systems; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
2. Purdue University; 401 N. Grant St West Lafayette IN 47907 USA
3. Birck Nanotechnology Center; 1205 W. State St West Lafayette IN 47907 USA
4. Thin-Film Device Laboratory & Center for Emergent Matter Science (CEMS); RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan