1. Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa 903-0123, Japan
2. Department of Physics and Earth Sciences, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
3. Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
4. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
5. Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 252-5258, Japan