Quantum mechanical analysis of the elastic propagation of electrons in the Au/Si system: application to Ballistic Electron Emission Microscopy

We present a Green's function approach based on a LCAO scheme to compute the elastic propagation of electrons injected from a STM tip into a metallic film. The obtained 2D current distribution in real and reciprocal space furnish a good representation of the elastic component of Ballistic Elect...

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Bibliographic Details
Published inarXiv.org
Main Authors Reuter, K, de Andres, P L, Garcia-Vidal, F J, Sestovic, D, Flores, F, Heinz, K
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 01.05.1998
Subjects
Band structure
Band structure of solids
Current distribution
Electron emission
Electrons
Emission microscopy
Gold
Green's functions
Mechanical analysis
Microscopy
Propagation
Quantum mechanics
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Summary:We present a Green's function approach based on a LCAO scheme to compute the elastic propagation of electrons injected from a STM tip into a metallic film. The obtained 2D current distribution in real and reciprocal space furnish a good representation of the elastic component of Ballistic Electron Emission Microscopy (BEEM) currents. Since this component accurately approximates the total current in the near threshold region, this procedure allows --in contrast to prior analyses-- to take into account effects of the metal band structure in the modeling of these experiments. The Au band structure, and in particular its gaps appearing in the [111] and [100] directions provides a good explanation for the previously irreconcilable results of nanometric resolution and similarity of BEEM spectra on both Au/Si(111) and Au/Si(100).
ISSN:2331-8422
DOI:10.48550/arxiv.9805008