Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: 1D Metal Wires on Semiconductors II

O 39.3: Vortrag

Dienstag, 8. März 2016, 14:30–14:45, S052

Fabrication of one-dimensional arrays of magic clusters using a vicinal Si surface as a template — •Martin Franz, Julia Schmermbeck, and Mario Dähne — Technische Universität Berlin, Institut für Festkörperphysik, 10623 Berlin, Germany

Self-assembled magic clusters on surfaces are fascinating not only from a fundamental scientific point of view, they are also promising candidates to employ such zero-dimensional nano objects in future applications such as high-density memory devices or in catalysis. In the present work, magic In clusters that form on the Si(111)7×7 surface are used as a model system to study how the array formation affects the electronic properties and to explore the possibility to produce one-dimensional (1D) arrays of magic clusters. For this purpose, scanning tunneling microscopy and spectroscopy are empoyed. The basic properties of these clusters, such as the atomic structure and the preparation procedure, are well known. In addition, it is possible to produce perfectly ordered two-dimensional (2D) arrays of these clusters on planar Si(111)7×7 samples. In the present work, different electronic properties and in particular different energy gaps are observed for clusters forming in the faulted and unfaulted half unit cell of the 7×7 reconstruction as well as for clusters neighboring other clusters. Furthermore, the Si(557) surface, which is a vicinal surface with narrow Si(111) terraces, is used as a template resulting in the formation of two different types of 1D arrays, similar to the two types of 2D arrays that are found on the planar Si(111) surface. This work was supported by the DFG through FOR 1282 project D.