Abstract
To understand the origin of the Si(111)−7 × 7 surface optical response, we have carried out microscopic calculations for model structures containing all the DAS-model building elements: a Si(111)−2 × 2 adatom-rest-atom model and a Si(111)−3 × 3 adatom-dimer-stacking fault model. Based on these results, the optical properties of the Si(111)−7 × 7 surface are extrapolated and the main optical peaks are interpreted in terms of the surface band structure. A fair agreement with the experimental data for the Si(111)−7 × 7 reconstruction is obtained.
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