1. Corporate Research and Development Center; Toshiba Corporation; 1 Komukai-Toshiba-cho Saiwai-ku Kawasaki, Kanagawa 212-8582 Japan
2. Energy Technology Research Institute; National Institute of Advanced Industrial Science and Technology (AIST); 1-1-1 Umezono Tsukuba, Ibaraki 305-8568 Japan
3. Core Research for Evolutional Science and Technology (CREST); Japan Science and Technology Agency (JST); c/o AIST Tsukuba, Ibaraki 305-8568 Japan