Evidence for saturation of channel transmission from conductance fluctuations in atomic-size point contacts

Details Evidence for saturation of channel transmission from conductance fluctuations in atomic-size point contacts Evidence for saturation of channel transmission from conductance fluctuations in atomic-size point contacts

1998-10-28

arxiv.org/abs/cond-mat/9810384v2

Phys. Rev. Lett. 82 (1999) 1530

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

An error in Eq.(2) was corrected, where a square root was added to the factor (1-cos(gamma)). This results in a revised estima

Scientific paper

10.1103/PhysRevLett.82.1530

The conductance of atomic size contacts has a small, random, voltage dependent component analogous to conductance fluctuations observed in diffusive wires (UCF). A new effect is observed in gold contacts, consisting of a marked suppression of these fluctuations when the conductance of the contact is close to integer multiples of the conductance quantum. Using a model based on the Landauer-Buettiker formalism we interpret this effect as evidence that the conductance tends to be built up from fully transmitted (i.e., saturated) channels plus a single, which is partially transmitted.

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