Volume 70, Number 5, June 2005
|Page(s)||663 - 669|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||29 April 2005|
Distribution of conduction channels in nanoscale contacts: Evolution towards the diffusive limit
Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada C-III, Universidad Autónoma de Madrid - E-28049 Madrid, Spain
2 Departamento de Física Teórica de la Materia Condensada C-V Universidad Autónoma de Madrid - E-28049 Madrid, Spain
3 Instituto Universitario de Ciencia de Materiales “Nicolás Cabrera” Universidad Autónoma de Madrid - E-28049 Madrid, Spain
Accepted: 8 April 2005
We present an experimental determination of the conduction channel distribution in lead nanoscale contacts with total conductances ranging from 1 to 15 G0, where . It is found that even for contacts having a cross section much smaller than the mean free path the distribution tends to be remarkably close to the universal diffusive limit. With the help of theoretical calculations we show that this behavior can be associated with the specific band structure of lead which produces a significant contribution of partially open channels even in the absence of atomic disorder.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 73.63.Rt – Nanoscale contacts / 73.40.Jn – Metal-to-metal contacts
© EDP Sciences, 2005
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