The electrostatic potential profile along a biased molecular wire: A model quantum mechanical calculation

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dc.creatorPleutin, Stéphane
dc.creatorGrabert, Hermann
dc.creatorIngold, Gert-Ludwig
dc.creatorNitzan, Abraham
dc.date2002-09-25
dc.date.accessioned2026-07-07T05:48:10Z
dc.date.available2026-07-07T05:48:10Z
dc.descriptionWe study the electrostatic potential of a molecular wire bridging two metallic electrodes in the limit of weak contacts. With the use of a tight-binding model including a fully three-dimensional treatment of the electrostatics of the molecular junction, the potential is shown to be poorly screened, dropping mostly along the entire molecule. In addition, we observe pronounced Friedel oscillations that can be related to the breaking of electron-hole symmetry. Our results are in semi-quantitative agreement with recent state-of-the-art ab initio calculations and point to the need of a three-dimensional treatment to properly capture the behavior of the electrostatic potential. Based on these results, current-voltage curves are calculated within the Landauer formalism. It is shown that Coulomb interaction partially compensates the localization of the charges induced by the electric field and consequently tends to suppress zones of negative differential resistance.
dc.description8 pages, 5 figures, RevTeX4
dc.identifierhttps://arxiv.org/abs/physics/0209091
dc.identifierhttp://arxiv.org/abs/physics/0209091
dc.identifierJ. Chem. Phys. 118, 3756 (2003)
dc.identifierdoi:10.1063/1.1539863
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/84924
dc.subjectChemical Physics
dc.subjectMesoscale and Nanoscale Physics
dc.titleThe electrostatic potential profile along a biased molecular wire: A model quantum mechanical calculation
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