1. Low Temperature Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
2. RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
3. Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
4. Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan
5. Institute of Physics, Kazan Federal University, Kazan 420008, Russia