1. RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan.
2. Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.
3. Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan.
4. Tokyo College, University of Tokyo, Tokyo 113-8656, Japan.
5. Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
6. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan.