1. Contribution from the State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, People's Republic of China, Lehrstuhl für Angewandte Physik and Centre for Nanoscience, Ludwig-Maximilians Universität München, Amalienstrasse 54, München 80799, Germany, Theoretical and Computational Biophysics Group, Beckman Institute, University of Illinois, 405 N. Mathews, Urbana, Illinois 61801, and Department of Physics, University of Illinois, 1110 W. Green, Urbana,...