1. State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science and Laboratory for Advanced Materials; Fudan University; Shanghai 200433 China
2. Department of Physics; Fudan University; Shanghai 200433 China
3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Chemistry; Chemical Engineering and Biotechnology; Center for Advanced Low-Dimension Materials; Donghua University; Shanghai 201620 China
4. Institute of Biochemistry and Cell Biology; Shanghai Institutes for Biological Sciences; Chinese Academy of Sciences; Shanghai 200031 China