1. Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Tokyo 113-8656, Japan
2. PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan
3. RIKEN Bioengineering Laboratory, Wako 351-0198, Japan
4. Department of Physics, Osaka University, Osaka 560-0043, Japan
5. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan