1. Institute
of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
2. State
Key Laboratory of Functional Materials for Informatics, Shanghai Institute
of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
3. Physics
Department and CENT, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia