1. Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo 060-8628, Japan
2. National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
3. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
4. Department of General Education, National Institute of Technology, Toyama College, Toyama 939-8630, Japan
5. Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan