Controlling the Local Electronic Properties of Si(553)-Au through Hydrogen Doping

Physical Review Letters
Conor HoganN Esser

Abstract

We propose a quantitative and reversible method for tuning the charge localization of Au-stabilized stepped Si surfaces by site-specific hydrogenation. This is demonstrated for Si(553)-Au as a model system by combining density functional theory simulations and reflectance anisotropy spectroscopy experiments. We find that controlled H passivation is a two-step process: step-edge adsorption drives excess charge into the conducting metal chain "reservoir" and renders it insulating, while surplus H recovers metallic behavior. Our approach illustrates a route towards microscopic manipulation of the local surface charge distribution and establishes a reversible switch of site-specific chemical reactivity and magnetic properties on vicinal surfaces.

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Citations

Feb 15, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Michael TzschoppeAnnemarie Pucci
Apr 28, 2020·Physical Review Letters·C BraunW G Schmidt
Mar 31, 2021·Physical Review Letters·Zamin MamiyevSimone Sanna

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