1. Center for Nanochemistry
(CNC), Beijing National Laboratory for Molecular Sciences, College
of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary
Studies, ‡Department of Materials Science and Engineering, College of Engineering, §Key Laboratory for the
Physics and Chemistry of Nanodevices, Department of Electronics, and ∥Center for Applied
Physics and Technology, Peking University, Beijing 100871, People’s Republic of China