1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
2. Green Innovation & Device Laboratories, Corporate Research & Development Group, Sharp Corporation, 2613-1 Ichinomotocho, Tenri, Nara 632-8567, Japan
3. The University of Tokyo Sharp Laboratories, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
4. Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan