Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.6: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Formation of Dysprosium clusters on Si(111)7x7 and Si(001)2x1 surfaces — •Martin Franz, Stephan Appelfeller, Michael Theurer, Monir Rychetsky, and Mario Dähne — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin, Deutschland

Clusters on surfaces are of high interest because of their fascinating quantum properties and their possible application in future nanodevices or catalysis. Here, dysprosium induced clusters on the Si(111)7x7 and on the Si(001)2x1 surface were studied using scanning tunneling microscopy. The clusters were grown by molecular beam epitaxy using submonolayer metal coverages and moderate annealing temperatures. It was found that the 7x7 reconstructed Si(111) surface acts as a template for cluster formation, where the clusters grow self-organized preferentially on the faulted halves of the 7x7 unit cells. Here different cluster types could be observed, depending on the growth conditions. For post-growth annealing off-center clusters which are located at an edge of the 7x7 half unit cells form, while at deposition directly on the heated substrate the preferential growth of centered clusters is observed. On the Si(001) surface no such template effect exists. Here, clusters are observed that show a one-dimensional ordering resulting in the presence of cluster-chains on the surface. This project was supported by the DFG through FOR 1282 project D.