6533b835fe1ef96bd129f447
RESEARCH PRODUCT
Disorder and dephasing effects on electron transport through conjugated molecular wires in molecular junctions
Daijiro NozakiHoracio M. PastawskiGianaurelio CunibertiClaudia Gomes Da Rochasubject
Condensed Matter - Materials ScienceMaterials scienceCondensed Matter - Mesoscale and Nanoscale Physicsta114Field (physics)Condensed matter physicsDephasingMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesThermal fluctuationsConductanceMolecular electronicsdephasingConjugated systemCondensed Matter PhysicsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectElectron transport chainElectronic Optical and Magnetic MaterialsMolecular wireelectronic transportMesoscale and Nanoscale Physics (cond-mat.mes-hall)grafeenidescription
Understanding electron transport processes in molecular wires connected between contacts is a central focus in the field of molecular electronics. Especially, the dephasing effect causing tunneling-to-hopping transition has great importance from both applicational and fundamental points of view. We analyzed coherent and incoherent electron transmission through conjugated molecular wires by means of density-functional tight-binding theory within the D'Amato-Pastawski model. Our approach can study explicitly the structure/transport relationship in molecular junctions in a dephasing environmental condition using only single dephasing parameter. We investigated the length dependence and the influence of thermal fluctuations on transport and reproduced the well-known tunneling-to-hopping transition. This approach will be a powerful tool for the interpretation of recent conductance measurements of molecular wires.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-03-31 |