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

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2016

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https://doi.org/10.1021/acs.nanolett.5b04848
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Nano Letters. 2016, 16(3), pp. 1803-1807. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.5b04848

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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.

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ISO 690KARIMI, Mohammad Amin, Safa G. BAHOOSH, Markus HERZ, Ryoma HAYAKAWA, Fabian PAULY, Elke SCHEER, 2016. Shot Noise of 1,4-Benzenedithiol Single-Molecule Junctions. In: Nano Letters. 2016, 16(3), pp. 1803-1807. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.5b04848
BibTex
@article{Karimi2016-03-09Noise-33606,
  year={2016},
  doi={10.1021/acs.nanolett.5b04848},
  title={Shot Noise of 1,4-Benzenedithiol Single-Molecule Junctions},
  number={3},
  volume={16},
  issn={1530-6984},
  journal={Nano Letters},
  pages={1803--1807},
  author={Karimi, Mohammad Amin and Bahoosh, Safa G. and Herz, Markus and Hayakawa, Ryoma and Pauly, Fabian and Scheer, Elke}
}
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    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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