Conductance Quantization and Electron Resonances in Sharp Tips and Atomic-Size Contacts
介观与纳米尺度物理
2016-08-15 v1
摘要
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.
引用
@article{arxiv.cond-mat/9708164,
title = {Conductance Quantization and Electron Resonances in Sharp Tips and Atomic-Size Contacts},
author = {A. Levy Yeyati and A. Martín-Rodero and F. Flores},
journal= {arXiv preprint arXiv:cond-mat/9708164},
year = {2016}
}
备注
4 pages, 3 postscript figures, to be published in Phys.Rev.B