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Electron transport through single conjugated organic molecules: Basis set effects in ab initio calculations

机译:电子通过单个共轭有机分子的传输:从头算中的基集效应

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We investigate electron transport through single conjugated molecules-including benzenedithiol, oligophenylene ethynylenes of different lengths, and a ferrocene-containing molecule sandwiched between two gold electrodes with different contact structures-by using a single-particle Green function method combined with density functional theory calculation. We focus on the effect of the basis set in the ab initio calculation. It is shown that the position of the Fermi energy in the transport gap is sensitive to the molecule-lead charge transfer which is affected by the size of basis set. This can dramatically change, by orders of magnitude, the conductance for long molecules, though the effect is only minor for short ones. A resonance around the Fermi energy tends to pin the position of the Fermi energy and suppress this effect. The result is discussed in comparison with experimental data.
机译:我们使用单粒子格林函数方法结合密度泛函理论计算,研究了通过单个共轭分子的电子传输,包括不同长度的苯二硫醇,低聚亚苯基亚乙炔以及夹在两个具有不同接触结构的两个金电极之间的含二茂铁的分子。我们关注从头算中基础设置的影响。结果表明,费米能量在传输间隙中的位置对分子-铅电荷转移很敏感,而电荷转移受基集大小的影响。尽管长分子的电导率影响很小,但它可以大幅度地改变长分子的电导率。费米能量周围的共振趋向于锁定费米能量的位置并抑制这种效应。与实验数据进行了讨论。

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