1. Research Institute for Soft Matter and Biomimetics & Fujian Provincial Key Laboratory for Soft Functional Materials Research, College of Materials, Xiamen University, Xiamen 361005, China
2. Physical
Chemistry, University of Konstanz, Universitätsstrasse 10, Box 714, 78457 Konstanz, Germany
3. Department
of Physics, Changji University, Changji 831100, China
4. Department
of Physics, National University of Singapore, 117542, Singapore