期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 2, 页码 570-573出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b11016
关键词
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资金
- National Natural Science Foundation of China [11674092, 21561162003]
- Hong Kong RGC [6301415, N_HKUST601/15]
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.
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