1. Chongqing Key Laboratory
of Multi-scale Manufacturing Technology, Chongqing Institute of Green
and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China
2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
3. Physics Department, Sichuan University, Chengdu 610064, P. R. China
4. Department
of Optoelectronic Engineering, Chongqing University, Chongqing, 40044, P. R. China