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First-principles scheme for spectral adjustment in nanoscale transport

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First-principles scheme for spectral adjustment in nanoscale transport. / Garcia-Suarez, Victor M.; Lambert, Colin J.
In: New Journal of Physics, Vol. 13, No. 5, 053026, 16.05.2011, p. -.

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Garcia-Suarez VM, Lambert CJ. First-principles scheme for spectral adjustment in nanoscale transport. New Journal of Physics. 2011 May 16;13(5):-. 053026. doi: 10.1088/1367-2630/13/5/053026

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@article{4bfef3e5c6de4a1fbebc10032d53d9b8,
title = "First-principles scheme for spectral adjustment in nanoscale transport",
abstract = "We implement a general method for correcting the low-bias transport properties of nanoscale systems within an ab initio methodology based on linear combinations of atomic orbitals. This method consists of adjusting the molecular spectrum, i.e. shifting the position of the occupied and unoccupied molecular orbitals to match the experimental highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO (HL)) gap. Thus we show how the typical problem of an underestimated HL gap can be corrected, leading to quantitative and qualitative agreement with experiments. We show that an alternative method based on calculating the position of the relevant transport resonances and fitting them to Lorentzians can significantly underestimate the conductance and does not accurately reproduce the electron transmission coefficient between resonances. We compare this simple method in an ideal system of a benzene molecule coupled to featureless leads to more sophisticated approaches, such as GW, and find rather good agreement between both. We also present the results of a benzenedithiolate molecule between gold leads, where we study different coupling configurations for straight and tilted molecules, and show that this method yields the observed evolution of two-dimensional conductance histograms. We also explain the presence of low-conductance zones in such histograms by taking into account different coupling configurations.",
author = "Garcia-Suarez, {Victor M.} and Lambert, {Colin J.}",
note = "This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.",
year = "2011",
month = may,
day = "16",
doi = "10.1088/1367-2630/13/5/053026",
language = "English",
volume = "13",
pages = "--",
journal = "New Journal of Physics",
issn = "1367-2630",
publisher = "IOP Publishing Ltd",
number = "5",

}

RIS

TY - JOUR

T1 - First-principles scheme for spectral adjustment in nanoscale transport

AU - Garcia-Suarez, Victor M.

AU - Lambert, Colin J.

N1 - This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

PY - 2011/5/16

Y1 - 2011/5/16

N2 - We implement a general method for correcting the low-bias transport properties of nanoscale systems within an ab initio methodology based on linear combinations of atomic orbitals. This method consists of adjusting the molecular spectrum, i.e. shifting the position of the occupied and unoccupied molecular orbitals to match the experimental highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO (HL)) gap. Thus we show how the typical problem of an underestimated HL gap can be corrected, leading to quantitative and qualitative agreement with experiments. We show that an alternative method based on calculating the position of the relevant transport resonances and fitting them to Lorentzians can significantly underestimate the conductance and does not accurately reproduce the electron transmission coefficient between resonances. We compare this simple method in an ideal system of a benzene molecule coupled to featureless leads to more sophisticated approaches, such as GW, and find rather good agreement between both. We also present the results of a benzenedithiolate molecule between gold leads, where we study different coupling configurations for straight and tilted molecules, and show that this method yields the observed evolution of two-dimensional conductance histograms. We also explain the presence of low-conductance zones in such histograms by taking into account different coupling configurations.

AB - We implement a general method for correcting the low-bias transport properties of nanoscale systems within an ab initio methodology based on linear combinations of atomic orbitals. This method consists of adjusting the molecular spectrum, i.e. shifting the position of the occupied and unoccupied molecular orbitals to match the experimental highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO (HL)) gap. Thus we show how the typical problem of an underestimated HL gap can be corrected, leading to quantitative and qualitative agreement with experiments. We show that an alternative method based on calculating the position of the relevant transport resonances and fitting them to Lorentzians can significantly underestimate the conductance and does not accurately reproduce the electron transmission coefficient between resonances. We compare this simple method in an ideal system of a benzene molecule coupled to featureless leads to more sophisticated approaches, such as GW, and find rather good agreement between both. We also present the results of a benzenedithiolate molecule between gold leads, where we study different coupling configurations for straight and tilted molecules, and show that this method yields the observed evolution of two-dimensional conductance histograms. We also explain the presence of low-conductance zones in such histograms by taking into account different coupling configurations.

U2 - 10.1088/1367-2630/13/5/053026

DO - 10.1088/1367-2630/13/5/053026

M3 - Journal article

VL - 13

SP - -

JO - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

IS - 5

M1 - 053026

ER -