1. Graduate School of Engineering Science, Yokohama National University 1 , 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
2. Quantum Information Research Center, Institute of Advanced Sciences, Yokohama National University 2 , 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
3. Research Center for Electronic and Optical Materials, National Institute for Materials Science 3 , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
4. Advanced Power Electronics Research Center, National Institute of Advanced Industrial Science and Technology 4 , 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan