1. Department of Chemistry, University of Wisconsin—Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
2. Center for Emergent Matter Science (CEMS), RIKEN, Wako 351-0198, Japan
3. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
4. Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan