Band structure of the Ca/Si(111)-(2x1) surface

Article

关键词: REGULAR STEP ARRAYS;    ELECTRONIC-STRUCTURE;    SI(111) SURFACE;    RECONSTRUCTION;    SILICON;    CHAINS;    SYSTEM;    MODEL;    SPIN;   

DOI  :  10.1103/PhysRevB.68.245316

来源: SCIE

【 摘 要 】

We have investigated the electronic structure of the Ca/Si(111)-(2x1) surface using angle-resolved photoelectron spectroscopy. Two semiconducting surface states were clearly observed in the bulk band gap, and one was found in a pocket of the bulk band projection. Qualitatively, the dispersions of the two surface states observed in the band gap agree well with theoretical dispersions for a clean Si(111)-(2x1) surface with the Seiwatz structure. Taking this result into account, we conclude that the two surface states in the band gap originate from orbitals of Si atoms that form a Seiwatz structure, and that two electrons are donated from Ca to Si per (2x1) unit cell. This conclusion supports the structure of the Ca/Si(111)-(2x1) surface proposed in the literature.

【 授权许可】

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