Conductance Quantization and Electron Resonances in Sharp Tips and Atomic-Size Contacts

Details Conductance Quantization and Electron Resonances in Sharp Tips and Atomic-Size Contacts Conductance Quantization and Electron Resonances in Sharp Tips and Atomic-Size Contacts

1997-08-21

arxiv.org/abs/cond-mat/9708164v1

Phys. Rev. B 56, 10369 (1997)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 postscript figures, to be published in Phys.Rev.B

Scientific paper

10.1103/PhysRevB.56.10369

The electronic and transport properties of atomic-size contacts are analyzed theoretically using a self-consistent tight-binding model. Our results show that, for s-like metals, a sufficiently narrow contact exhibits well defined resonant states at the Fermi energy, spatially localized in the neck region. These states are robust with respect to disorder and provide a simple explanation for the observed tendency to conductance quantization. It is also shown that these properties disappear for a sufficiently large contact area. The possible relevance of this resonant states in scanning tunneling spectroscopy using sharp tips is briefly analized.

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