1. Department of Chemistry, College of Humanities
and Sciences, Nihon University, Sakurajosui
3-25-40, Setagaya-Ku, Tokyo 156-8550, Japan
2. Condensed Molecular Materials Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3. Department of Applied Physics, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo
113-8656, Japan