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. Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
3. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
4. Beijing Institute of Carbon-based Integrated Circuits, Beijing 100195, China