文献类型：期刊文献

英文题名：Negative Differential Conductance in Polyporphyrin Oligomers with Nonlinear Backbones

作者：Kuang, Guowen[1];Chen, Shi Zhang[2];Yan, Linghao[1];Chen, Ke Qiu[2];Shang, Xuesong[3,4];Liu, Pei Nian[3,4];Lin, Nian[1]

机构：[1]Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China;[2]Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Meilong Rd 130, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem & Mol Engn, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2018

卷号：140

期号：2

起止页码：570

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20180404665459);WOS:【SCI-EXPANDED(收录号:WOS:000423012600011)】；

基金：This research was supported by Hong Kong RGC (No. 6301415), N_HKUST601/15 and National Natural Science Foundation of China (Nos. 11674092 and 21561162003).

语种：英文

外文关键词：Density functional theory - Molecular orbitals - Temperature

摘要：We study negative -differential conductance (NDC) effects in polyporphyrin oligomers with nonlinear backbones. Using a low-temperature scanning tunneling microscope, we selectively controlled the charge transport path in single oligomer wires. We observed robust NDC when charge passed through a T-shape junction, bistable NDC when charge passed through a 90 degrees kink and no NDC when charge passed through ,a 120 degrees kink. Aided by density functional -theory with nonequilibrium Green's functions simulations, we attributed this backbone-dependent NDC to bias-modulated hybridization of the electrode states with the resonant transport molecular orbital. We argue this mechanism is generic in molecular systems, which opens a new route of designing molecular NDC devices.