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Local Topographic and Electronic Structure of Mixed Surface Alloys : Anderson Localization of Electronic States

Local Topographic and Electronic Structure of Mixed Surface Alloys : Anderson Localization of Electronic States

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ZINSER, Fabian, 2012. Local Topographic and Electronic Structure of Mixed Surface Alloys : Anderson Localization of Electronic States

@phdthesis{Zinser2012Local-24429, title={Local Topographic and Electronic Structure of Mixed Surface Alloys : Anderson Localization of Electronic States}, year={2012}, author={Zinser, Fabian}, address={Konstanz}, school={Universität Konstanz} }

2013-09-19T09:43:04Z Zinser, Fabian In this work, the atomic and electronic structure of mixed surface alloys is studied using a scanning tunneling microscope with variable temperature. The examined class of surface alloys is formed by substitution of every third atom of a Ag(111) surface with the elements Bi, Pb or Sb. While the pure surface alloys consist of only one substituent, mixed surface alloys consist of several substituents with an arbitrary ratio.<br /><br /><br /><br />For the mixed surface alloys it is possible for the first time to demonstrate the localization of electronic states due to atomic disorder (Anderson localization) on a local scale by comparing topographic and corresponding electronic structures. Using a tight-binding model for disordered lattice structures, the experimental results can be directly reproduced in simulations.<br /><br /><br /><br />The topographic studies of the mixed surface alloys reveal that the particular substituents retain their individual relaxation even when different substituents are mixed, and so an analysis of the chemical composition of the surface with atomic resolution is possible. The statistical distribution of the particular substituents in the mixed surface alloys is disordered but not fully random. A small, attractive effective pair interaction between substitutional atoms of the same element is demonstrated by a comparison with Monte-Carlo simulations.<br /><br /><br /><br />A distinct difference in the behavior of the examined mixed surface alloys can be demonstrated for the development of the monolayer phase in the case of an excess of substituents. It can be shown for the growth of the pure surface alloy Bi/Ag on a thin, heteroepitaxial Ag/Pt(111) film, that the presence of bismuth strongly influences the growth of the Ag/Pt(111) film.<br /><br /><br /><br />The variety of pure surface alloys with individual electronic properties, which can be combined with arbitrary ratio into mixed surface alloys, makes it possible to extend experimental studies of the Anderson localization of electronic states to a wide range of parameters and to examine the influence of of different effects, such as spin-orbit interaction. Lokale topographische und elektronische Struktur gemischter Oberflächenlegierungen : Anderson-Lokalisierung elektronischer Zustände 2013-09-19T09:43:04Z 2012 Local Topographic and Electronic Structure of Mixed Surface Alloys : Anderson Localization of Electronic States Zinser, Fabian eng deposit-license

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

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