Local state density and long-range screening of adsorbed oxygen atoms on the GaAs(110) surface
- 20 April 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 58 (16), 1668-1671
- https://doi.org/10.1103/physrevlett.58.1668
Abstract
We report scanning tunneling microscope images of isolated oxygen atoms adsorbed on the GaAs(110) surface. The images display a dramatic voltage dependence, which arises from the energy dependence of the local state density, and provides a signature of an adsorbed electronegative atoms. At low oxygen coverages, a long-range screening of the adsorbed atoms is observed in the surrounding bare surface region, with a characteristic screening length scale of ∼50 Å. .AEKeywords
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