Abstract
STM images of the Si(111) 3 × 3 -Ag surface have been calculated from first principles on the basis of a recently proposed structural model, the modified honeycomb-chained-trimer (HCT) model. Although this model appears to be inconsistent with reported STM images at first sight, calculated images with application of negative bias voltages to the tip show excellent agreement with reported ones. It is found that each bright spot in the reported STM images does not represent an individual atom but corresponds to the center of each surface Ag trimer.
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