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Electronic structure of the Ca/Si(111)-(3×2) surface
Department of Physics, Graduate School of Science, Tohoku 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.
2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 69, no 12, 1253211-1253217 p.Article in journal (Refereed) Published
Abstract [en]

The electronic structure of the Ca/Si(111)-(3×2) surface has been investigated by angle-resolved photoelectron spectroscopy. Five surface states, none of which crosses the Fermi level, were observed in the bulk band gap, and one surface state was observed in a bulk band pocket. The dispersion features of three of the surface states in the band gap agree well with results from monovalent atom adsorbed Si(111)-(3×1) surfaces along the chain direction. The close resemblance indicates that the origins of the surface states are the same as or quite similar to those of the (3×1) surface. The two other states observed in the band gap have not been reported in the literature, and they are interpreted as surface states that occur on Ca/Si(111)-(3×2) due to the lower coverage (1/6 monolayer of Ca). Further, based on the finite surface state dispersion in the direction perpendicular to the Ca chains, we conclude that the electronic character of this surface is not completely one dimensional.

Place, publisher, year, edition, pages
2004. Vol. 69, no 12, 1253211-1253217 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-41804DOI: 10.1103/PhysRevB.69.125321ISI: 000221259000084Local ID: 59126OAI: oai:DiVA.org:liu-41804DiVA: diva2:262659
Available from: 2013-03-27 Created: 2009-10-10 Last updated: 2017-12-13Bibliographically approved

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Zhang, HanminUhrberg, Roger

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