Generalized conductance sum rule in atomic break junctions

Details Generalized conductance sum rule in atomic break junctions Generalized conductance sum rule in atomic break junctions

2000-10-06

arxiv.org/abs/cond-mat/0010103v1

in "Kondo Effect and dephasing in low-dimensional metallic systems", NATO Science Series II, vol. 50, 215 (Kluwer Academic Pub

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure, appears in Proceedings of the NATO Advanced Research Workshop ``Size dependent magnetic scattering'', Pecs,

Scientific paper

When an atomic-size break junction is mechanically stretched, the total conductance of the contact remains approximately constant over a wide range of elongations, although at the same time the transmissions of the individual channels (valence orbitals of the junction atom) undergo strong variations. We propose a microscopic explanation of this phenomenon, based on Coulomb correlation effects between electrons in valence orbitals of the junction atom. The resulting approximate conductance quantization is closely related to the Friedel sum rule.

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