Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-03-29
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 12 figures
Scientific paper
We present a comprehensive study of the properties of the off-resonant conductance spectrum in oligomer nanojunctions between graphitic electrodes. By employing first-principle-based methods and the Landauer approach of quantum transport, we identify how the electronic structure of the molecular junction components is reflected in electron transport across such systems. For virtually all energies within the conduction gap of the corresponding idealised polymer chain, we show that: a) the inverse decay length of the tunnelling conductance is intrinsically defined by the complex-band structure of the molecular wire despite ultrashort oligomer lengths of few monomer units, and b) the contact conductance crucially depends on both the local density of states on the metal side and the realised interfacial contact.
Fagas Giorgos
Kambili Agapi
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