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

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• 作者：M. A. Karimi ; S. G. Bahoosh ; M. Herz ; R. Hayakawa ; F. Pauly ; E. Scheer
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：1803-1807
• 全文大小：356K
• ISSN：1530-6992

文摘

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.