[1] RIKEN Ctr Emergent Matter Sci CEMS, Wako, Saitama 3510198, Japan
[2] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan
[3] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[4] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan
[5] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan