STRUCTURAL AND ELECTRONIC PROPERTIES OF THE Li/Si(001) SURFACE

J.W. Chung
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J.W. Chung: Physics Department and Basic Science Research Institute, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang 790-784, Korea

Surface Review and Letters (SRL), 1996, vol. 03, issue 03, 1487-1494

Abstract: Atomic arrangements and electronic properties of the Li-adsorbed Si(001) surface are briefly reviewed. Characteristic features of a series of ordered structures with increasing Li coverage at room temperature are described. Structural models invoking a dimer flipping mechanism are discussed for the first two ordered structures,(2×2)-Li and(2×1)-Li, which are proposed as reconstructions of the silicon substrate. It is shown that the metallic phase found at an initial stage of adsorption is a result of substrate metallization, which explains the presence of an intraband surface plasmon. The features of the surface band structures for the first two ordered structures are discussed in terms of variation of the binding sites with coverage. All the unique features of the Li/Si(001) surface essentially exhibit the size effects of Li.

Date: 1996
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DOI: 10.1142/S0218625X96002497

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