1. Department of Mechanical Engineering, Keio University, 223-8522 Yokohama, Japan
2. Faculty of Mechanical Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
3. Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany
4. Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
5. Institut für Theoretische Physik, Technische Universität Dresden, 01069 Dresden, Germany