1. Key Laboratory of Polar Materials and Devices, Ministy of Education; School of Information Science Technology; East China Normal University; 200241 Shanghai P. R. China
2. Institute of Functional Nano & Soft Materials (FUNSOM); Soochow University; Suzhou 215123 P. R. China
3. Department of Physics; Chemistry and Biology; IFM; Linköping University; SE-58183 Linköping Sweden
4. Collaborative Innovation Center of Extreme Optics; Shanxi University; Taiyuan Shanxi 030006 P. R. China
5. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices; Soochow University; Suzhou 215123 P. R. China