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Publication
Physical Review Letters
Paper
Local state density and long-range screening of adsorbed oxygen atoms on the GaAs(110) surface
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 Ai<>.. AE © 1987 The American Physical Society.