1. School
of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi-shi, Ishikawa 923-1292, Japan
2. Department of Chemistry, Faculty of Science, Saitama University, 225 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
3. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
4. RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan