1. Center for Emergent Matter Science (CEMS) RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
2. Department of Modern Mechanical Engineering Waseda University 3‐4‐1 Okubo, Shinjuku‐ku Tokyo 169‐8555 Japan
3. Center for Sustainable Resource Science (CSRS) RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
4. Thin‐Film Device Laboratory RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
5. Department of Electrical Engineering and Information Systems The University of Tokyo 7‐3‐1 Hongo, Bunkyo‐ku Tokyo 113‐8656 Japan