1. Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-Based Electronics, School of Electronics, Peking University, Beijing 100871, China
2. Jihua Laboratory, Foshan, Guangdong 528200, China
3. State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310007, China
4. State Key Laboratory of Advanced Optical Communication System and Networks, School of Electronics, Peking University, Beijing 100871, China
5. Department of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
6. Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, China