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Band structure of the Ca/Si(111)-(2×1) surface
Graduate School of Advanced Integration Science, Chiba University, Japan.
Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics. Linköping University, The Institute of Technology.
2003 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 68, no 24, 245316- p.Article in journal (Refereed) Published
Abstract [en]

We have investigated the electronic structure of the Ca/Si(111)-(2×1) 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)-(2×1) 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 (2×1) unit cell. This conclusion supports the structure of the Ca/Si(111)-(2×1) surface proposed in the literature.

Place, publisher, year, edition, pages
2003. Vol. 68, no 24, 245316- p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-41806DOI: 10.1103/PhysRevB.68.245316ISI: 000188391900066Local ID: 59128OAI: oai:DiVA.org:liu-41806DiVA: diva2:262661
Available from: 2013-03-27 Created: 2009-10-10 Last updated: 2013-03-27Bibliographically approved

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Zhang, HanminUhrberg, Roger

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