Publication
Physical Review Letters
Paper

Empty surface states on the Si(100)2×1-K surface: Evidence for overlayer metallization

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Abstract

The electronic structure of potassium-covered single-domain Si(100)2×1 surfaces has been studied with angle-resolved direct (ultraviolet) and inverse photoemission at room temperature. At saturation coverage, the surface is metallic due to the filling of the minimum of a strongly dispersive empty surface state of mainly K 4pz character. Parabolic-like dispersions are observed for this state in the "»-J» and the "»-J» directions (i.e., both along and perpendicular to the dimer rows), showing the metallic bonding in the overlayer and a strong K-K interaction in both directions. © 1991 The American Physical Society.

Date

14 Oct 1991

Publication

Physical Review Letters

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