1. Institute
for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
2. Graduate
School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan
3. Drittes
Physikalisches Institut - Biophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz
1, 37073 Göttingen, Germany
4. Department
of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-8656, Japan