Microscopic origin of the conducting channels in metallic atomic-size contacts

Details Microscopic origin of the conducting channels in metallic atomic-size contacts Microscopic origin of the conducting channels in metallic atomic-size contacts

1997-11-25

arxiv.org/abs/cond-mat/9711263v1

Phys. Rev. Lett. 80, 1066 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 4 ps-figures. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.80.1066

We present a theoretical approach which allows to determine the number and orbital character of the conducting channels in metallic atomic contacts. We show how the conducting channels arise from the atomic orbitals having a significant contribution to the bands around the Fermi level. Our theory predicts that the number of conducting channels with non negligible transmission is 3 for Al and 5 for Nb one-atom contacts, in agreement with recent experiments. These results are shown to be robust with respect to disorder. The experimental values of the channels transmissions lie within the calculated distributions.

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