The intensity of the two branches, which were observed in a recent ARUPS experiment on a single domain Si(100)c(4 × 2) surface, is studied by the tight-binding method for the ensemble of the surface buckled dimers. The calculated ARUPS intensity of the branch corresponding to the extra branch observed on a 2 × 1 surface at room temperature vanishes on the Γ-J' axis for the conventional c(4 × 2) structure because of its symmetry. The ARUPS intensity is investigated in the cases where displacements of the surface atoms from the conventional structure are introduced holding c(4 × 2) lattice symmetry. A sizable amount of the intensity is obtained only when the dimer as a whole is displaced up and down alternately along the row. A model of the dimer structure is proposed to explain the qualitative feature of the observed intensity.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry