1. Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
2. RIKEN Center for Emergence Matter Science (CEMS), Wako, Saitama 351-0198, Japan
3. JST, CREST, Wako, Saitama 351-0198, Japan
4. Condensed Molecular Materials Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
5. National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
6. Department of Physics, Nagoya University, Nagoya 464-8602, Japan