1. Supramolecular Science Laboratory, RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan, and Department of Physics, Faculty of Science, Science University of Tokyo, Shinjuku, Tokyo 162-0825, Japan
2. Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan