1. Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
2. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
3. PRESTO, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan
4. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
5. Tokyo College, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan