Localized Electron States Near a Metal-Semiconductor Nanocontact

Details Localized Electron States Near a Metal-Semiconductor Nanocontact Localized Electron States Near a Metal-Semiconductor Nanocontact

2007-04-25

arxiv.org/abs/0704.3451v1

Physics

Condensed Matter

Materials Science

11 pages 4 figures

Scientific paper

The electronic structure of nanowires in contact with metallic electrodes of experimentally relevant sizes is calculated by incorporating the electrostatic polarization potential into the atomistic single particle Schr\"odinger equation. We show that the presence of an electrode produces localized electron/hole states near the electrode, a phenomenon only exhibited in nanostructures and overlooked in the past. This phenomenon will have profound implications on electron transport in such nanosystems. We calculate several electrode/nanowire geometries, with varying contact depths and nanowire radii. We demonstrate the change in the band gap of up to 0.5 eV in 3 nm diameter CdSe nanowires and calculate the magnitude of the applied electric field necessary to overcome the localization.

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