Affiliation: | Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials, Xiamen University, Xiamen 361005 P. R. China.; Jiujiang Research Institute of Xiamen University, Jiujiang 332000 P. R. China ; Shenzhen Research Institute of Xiamen University, Shenzhen 518057 P. R. China |