1. Thin-Film Device Laboratory; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
2. Electrical and Electronic Engineering and Information Systems; The University of Tokyo; 7-3-1 Bunkyo-ku Tokyo 113-8656 Japan
3. Center for Emergent Matter Science; RIKEN; 2-1 Hirosawa Wako Saitama 351-0198 Japan
4. Japan Science and Technology Agency; PRESTO; 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
5. Department of Applied Chemistry; Hiroshima University; 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8527 Japan