Self-assembled germanium nano-clusters on silver(1 1 0) |
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Authors: | C. Lé andri,J.M. Gay,G. Le Lay,A. Ranguis,R.L. Johnson |
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Affiliation: | a CRMCN-CNRS, Department of Physics, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France b II. Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany |
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Abstract: | The adsorption of germanium on Ag(1 1 0) has been investigated by scanning tunnelling microscopy (STM), as well as surface X-ray diffraction (SXRD). At 0.5 germanium monolayer (ML) coverage, Low Energy Electron Diffraction (LEED) patterns reveals a sharp c(4 × 2) superstructure. Based on STM images and SXRD measurements, we present an atomic model of the surface structure with Ge atoms forming tetramer nano-clusters perfectly assembled in a two-dimensional array over the silver top layer. The adsorption of the germanium atoms induces a weak perturbation of the Ag surface. Upon comparison with results obtained on the (1 1 1) and (1 0 0) faces, we stress the role played by the relative interactions between silver and germanium on the observed surface structures. |
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Keywords: | Self-assembly Clusters Surface structure, morphology, roughness, and topography Germanium Silver Scanning tunneling microscopy X-ray scattering, diffraction, and reflection |
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