1. Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
2. The Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan
3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4. Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
5. Department of Quantum Matter, Graduate School of Advanced Sciences of Matter (ADSM), Hiroshima University, Higashi-Hiroshima 739-8530, Japan
6. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
7. Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
8. Department of Physics, Columbia University, New York, New York 10027, United States
9. Department of Applied Physics, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan