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Paper
Sodium-induced 2×11×1 surface structural transition on Si(111)
Abstract
Sodium deposited on the cleaved Si(111)2×1 surface induces a 2×11×1 surface structural transition at about 1/2 monolayer coverage. Angle-resolved direct and inverse photoemission reveal the surface to be semiconducting. The measured energy dispersion of the empty Na-induced surface state is only consistent with calculations that favor the threefold-hollow site for the Na adsorption position. Its bonding character (ionic versus covalent) will be discussed. © 1992 The American Physical Society.