Self-organization of Ge tetramers on Ag(001) surface: A 2D realization of unusual substrate mediated interactions

    Authors

    H. Oughaddou; B. Aufray; J. P. Biberian; B. Ealet; G. Le Lay; G. Treglia; A. Kara;T. S. Rahman

    Comments

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    Abbreviated Journal Title

    Surf. Sci.

    Keywords

    ising models; construction and use of effective interatomic; interactions; scanning tunneling microscopy; diffusion and migration; surface structure; morphology; roughness; and topography; surface; thermodynamics; self-assembly; germanium; ALLOY SURFACES; DISSOLUTION KINETICS; SEGREGATION; RECONSTRUCTION; GERMANIUM; LEED; Chemistry, Physical; Physics, Condensed Matter

    Abstract

    Scanning tunneling microscopy (STM) images recorded during dissolution of a half-monolayer Ge on a Ag(0 0 1) show that it proceeds by the disappearance of tetramer entities. Moreover, they reveal that the successive slowing down in the kinetics, observed during this dissolution, correspond to the formation of ordered 2D arrangements of tetramer vacancies. A lattice gas analysis of the latter predicts a very unusual sequence of pair interactions between these vacancies, probably mediated by the substrate. (C) 2007 Elsevier B.V. All rights reserved.

    Journal Title

    Surface Science

    Volume

    602

    Issue/Number

    2

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    506

    Last Page

    510

    WOS Identifier

    WOS:000253277900017

    ISSN

    0039-6028

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