Department of Physics and ITPA, Xiamen University, Xiamen 361005, China;
Department of Electronic Engineering, Putian University, Putian 351100, China;
Department of Physics and ITPA, Xiamen University, Xiamen 361005, China;
Leibniz-Institut fürPolymerforschung Dresden, Dresden 01069, Germany;
Department of Physics and ITPA, Xiamen University, Xiamen 361005, China;
Department of Physics and ITPA, Xiamen University, Xiamen 361005, China;