1. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
2. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
3. Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
4. Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan