Journal
SURFACE SCIENCE
Volume 531, Issue 1, Pages 1-7Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(03)00508-9
Keywords
density functional calculations; surface structure, morphology, roughness, and topography; metal-semiconductor interfaces; gold; silicon
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The atomic structure of the Au/Si(1 1 1)-(5 x 2) surface has been studied by density-functional theory calculations. Two structure models, proposed experimentally by Marks et al. and Hasegawa et al., have been examined on an equal ground. In our total-energy calculations, both models are found to be locally stable and energetically comparable. In our electronic-structure analyses, however, both models fail to reproduce the key features of angle-resolved photo-emission spectra and scanning-tunneling-microscopy images, indicating that the considered models need to be modified. Suggestions for the modification are given based on the present calculations. (C) 2003 Elsevier Science B.V. All rights reserved.
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