1. RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
2. PRESTO, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan
3. Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
4. Department of Physics, University of California, Berkeley, California 94720, USA
5. Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
6. Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany