1. Research Institute for Electronic Science Hokkaido University Sapporo Hokkaido 001–0020 Japan
2. Faculty of Engineering Hokkaido University Sapporo Hokkaido 060–8628 Japan
3. Graduate School of Engineering Kyushu Institute of Technology 1‐1 Sensui‐cho, Tobata Kitakyushu 804–8550 Japan
4. Department of Chemistry University of Pennsylvania Philadelphia Pennsylvania 19104‐6323 USA
5. System Platform Research Laboratories NEC Corporation 1753 Shimonumabe, Nakahara Kawasaki 211–8666 Japan
6. Center for Crystal Science and Technology University of Yamanashi Kofu Yamanashi 400‐0021 Japan
7. College of Science and Technology Nihon University 1‐8‐14 Surugadai, Kanda, Chiyoda‐ku Tokyo 101–8308 Japan
8. Department of Physics Tokyo University of Science 1–3 Kagurazaka Shinjyuku‐ku Tokyo 162–8601 Japan
9. Department of Applied Physics and Physico‐Informatics Faculty of Science and Technology Keio University Yokohama Kanagawa 223–8522 Japan