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

Karimi, Mohammad Amin; Bahoosh, Safa G.; Herz, Markus; Hayakawa, Ryoma; Pauly, Fabian; Scheer, Elke

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

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Date

2016

Publication type

Journal article

Publication status

Published

Published in

Nano Letters ; 16 (2016), 3. - pp. 1803-1807. - ISSN 1530-6984. - eISSN 1530-6992

Abstract

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.

Subject (DDC)

530 Physics

Cite This

ISO 690

KARIMI, 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. 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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Bibliography of Konstanz

Yes