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arXiv 0705.3409cond-mat.mes-hallcond-mat.mtrl-sci
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单个共轭有机分子的电子输运：从头计算中的基组效应

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

San-Huang Ke, Harold U. Baranger, Weitao Yang

备注：
6 pages, 7 figures
发表信息：
J. Chem. Phys. 127, 144107 (2007)
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摘要：

我们采用单粒子格林函数方法结合密度泛函理论计算研究了单共轭分子（包括苯二硫醇、不同长度的低聚亚苯基乙炔和夹在两个具有不同接触结构的金电极之间的含二茂铁分子）的电子输运.我们重点讨论了基组在从头计算中的作用。结果表明，费米能级在输运带隙中的位置对分子-铅的电荷转移很敏感，并受基组大小的影响。这可以显著地改变长分子的电导率，改变的数量级很大，尽管对短分子的影响很小。费米能周围的共振倾向于固定费米能的位置并抑制这种效应。并与实验数据进行了比较。

英文摘要：

We investigate electron transport through single conjugated molecules - including benzenedithiol, oligo-phenylene-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.

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