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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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
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