Shot Noise of 1,4-Benzenedithiol Single-Molecule Junctions,Nano Letters

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Shot Noise of 1,4-Benzenedithiol Single-Molecule Junctions
Nano Letters ( IF 9.6 ) Pub Date : 2016-02-15 00:00:00 , DOI: 10.1021/acs.nanolett.5b04848
M. A. Karimi ₁ , S. G. Bahoosh ₁ , M. Herz ₁ , R. Hayakawa _{1,

2} , F. Pauly ₁ , E. Scheer ₁

Affiliation

We report measurements of the shot noise on single-molecule Au–1,4-benzenedithiol–Au junctions, fabricated with the mechanically controllable break junction (MCBJ) technique at 4.2 K in a wide range of conductance values from 10^–2 to 0.24 conductance quanta. We introduce a simple measurement scheme using a current amplifier and a spectrum analyzer and that does not imply special requirements regarding the electrical leads. The experimental findings provide evidence that the current is carried by a single conduction channel throughout the whole conductance range. This observation suggests that the number of channels is limited by the Au-thiol bonds and that contributions due to direct tunneling from the Au to the π-system of the aromatic ring are negligible also for high conductance. The results are supported by quantum transport calculations using density functional theory.

中文翻译：

1,4-苯二硫醇单分子连接点的散粒噪声

我们报告了单分子Au–1,4-苯二硫醇–Au结上散粒噪声的测量结果，该结是通过机械可控的断裂结（MCBJ）技术在4.2 K的电导率范围从10 ^–2制备的到0.24的电导量子我们介绍了一种使用电流放大器和频谱分析仪的简单测量方案，但这并不意味着对电气引线有特殊要求。实验结果提供了证据，表明电流在整个电导范围内由单个传导通道承载。该观察结果表明，通道的数量受到Au-硫醇键的限制，并且由于从Au到芳环的π系统的直接隧穿而引起的贡献对于高电导也可以忽略不计。使用密度泛函理论的量子输运计算支持了该结果。

更新日期：2016-02-15

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