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Aureli, I.; Corradini, V.; Mariani, C.; Placidi, E.; Arciprete, F.; Balzarotti, A.
Surface science, 02/2005, Volume: 576, Issue: 1Journal Article
The (4 × 2) epitaxial InAs(0 0 1) surface grown by molecular beam epitaxy and subjected to different surface treatments, namely amorphous As-de-capping and ion-bombardment annealing (IBA), is investigated by high-resolution angular-resolved UV photoelectron spectroscopy. Both treatments produce a semiconducting surface, ruling out the presence of metallic In aggregates. Binding energy shifts of 0.2–0.3 eV are measured for the valence-band levels of the IBA surface with respect to the de-capped surface, implying an important influence of the surface treatment on the subsurface region. The line-shape of the In-4d core levels, which consists of two different In-related surface doublets, is discussed in view of the recently proposed structural models based on dimers formation.
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