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Identification of the basic structure of the Ag/Si(111)-(6×1) surface: Observation of a low-temperature c(12×2) phase
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Department of Physics, Graduate School of Science, Tohoku University, Japan .
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics. Linköping University, The Institute of Technology.
2002 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 65, no 4, 045305- p.Article in journal (Refereed) Published
Abstract [en]

The surface structure of the so-called Ag/Si(111)-(6×1) surface is studied by low-energy electron diffraction (LEED), high-resolution core-level photoelectron spectroscopy, and angle-resolved photoelectron spectroscopy. A c(12×2) phase is observed in LEED after cooling the room-temperature (6×1) phase to 100 K. In the Si 2p core-level spectra, no significant difference is observed between the two surfaces. In the valence-band spectra, five surface states are observed on both the (6×1) and c(12×2) surfaces. None of these surface states crosses the Fermi level. The binding energies and dispersions of the surface states observed on the (6×1) surface are quite similar to those of the c(12×2) surface. These results indicate that the basic structure of this Ag/Si(111) surface has a c(12×2) periodicity, and that the (6×1) structure results from thermal vibrations of the surface atoms. Moreover, we assign two of the surface states to bonding states between Ag and Si atoms, and one of them to a π-bond state.

Place, publisher, year, edition, pages
2002. Vol. 65, no 4, 045305- p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-47904DOI: 10.1103/PhysRevB.65.045305ISI: 000173646800047OAI: oai:DiVA.org:liu-47904DiVA: diva2:268800
Available from: 2013-03-27 Created: 2009-10-11 Last updated: 2017-12-13Bibliographically approved

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Zhang, HanminUhrberg, Roger

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