Distance dependence of the interaction between single atoms: gold dimers on NiAl(110)

The importance of substrate-mediated adsorbate-adsorbate interactions on electronic states has been demonstrated for Au dimers on NiAl(110) with a scanning tunneling microscope and density functional calculations. An unoccupied resonance observed in single Au atoms splits into a doublet in Au dimers...

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Bibliographic Details
Published in:Physical review letters 2003-05, Vol.90 (19), p.196103-196103, Article 196103
Main Authors: Nilius, N, Wallis, T M, Persson, M, Ho, W
Format: Article
Language:English
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Summary:The importance of substrate-mediated adsorbate-adsorbate interactions on electronic states has been demonstrated for Au dimers on NiAl(110) with a scanning tunneling microscope and density functional calculations. An unoccupied resonance observed in single Au atoms splits into a doublet in Au dimers. The energy splitting depends inversely on the distance between the two adatoms, revealing the relative importance of direct and substrate-mediated interactions. Spatially resolved conductance measurements of Au dimers reveal the symmetric and antisymmetric characters of the doublet states.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.196103