Long-Range Gating in Single-Molecule One-Dimensional Topological Insulators

被引:0
|
作者
Li, Liang [1 ]
Louie, Shayan [1 ]
Orchanian, Nicholas M. [1 ]
Nuckolls, Colin [1 ]
Venkataraman, Latha [1 ,2 ]
机构
[1] Columbia Univ, Dept Chem, New York, NY 10027 USA
[2] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
JUNCTION CONDUCTANCE; CHARGE-TRANSPORT; DEPENDENCE; POLYACETYLENE; INTERFERENCE; SOLITONS; VOLTAGE;
D O I
10.1021/jacs.4c05699
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Single-molecule one-dimensional topological insulator (1D TI) is a class of molecular wires that exhibit increasing conductance with wire length. This unique trend is due to the coupling between the two low-lying topological edge states of 1D TIs described by the Su-Schrieffer-Heeger model. In principle, this quantum phenomenon within 1D TIs can be utilized to achieve long-range gating in molecular conductors. Here, we study electron transport through a single-edge state of doubly oxidized oligophenylene bis(triarylamine) to understand the effect of the edge state coupling on conductance. We find that conductance is elevated by approximately 1 order of magnitude compared to a control molecule with the same conductance pathway. Density function theory calculations further support that the increase in conductance is due to the interaction between the edge states of 1D TIs. This work demonstrates a new gating paradigm in molecular electronics, while also providing a deeper understanding of how edge states interact and affect electron transport within 1D TIs.
引用
收藏
页码:16920 / 16925
页数:6
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