1. Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113−8656, Japan
2. Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351−0198, Japan
3. Thin-Film Device Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351−0198, Japan
4. Institute of Engineering Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1 Bunkyo-ku, Tokyo 113−8656, Japan
5. Department of Modern Mechanical Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan