Fagas, Giorgos and Cuniberti, Gianaurelio and Richter, Klaus (2001) Electron transport in nanotube-molecular wire hybrids. Physical Review B 63 (4), 045416.
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Other URL: http://link.aps.org/abstract/PRB/v63/e045416
We study contact effects on electron transport across a molecular wire sandwiched between two semi-infinite (carbon) nanotube leads as a model for nanoelectrodes. Employing the Landauer scattering matrix approach, we find that the conductance is very sensitive to parameters such as the coupling strength and geometry of the contact. The conductance exhibits markedly different behavior in the two limiting scenarios of single contact and multiple contacts between the molecular wire and the nanotube interfacial atoms. In contrast to a single contact, the multiple-contact configuration acts as a filter selecting single transport channels. It exhibits a scaling law for the conductance as a function of coupling strength and tube diameter. We also observe an unusual narrow-to-broad-to-narrow behavior of conductance resonances upon decreasing the coupling.
|Institutions:|| Physics > Institute of Theroretical Physics > Retired Professors > Group Gianaurelio Cuniberti|
Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 20:57|