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With first-principles methods, we investigate the stability of isolated Ptn clusters from Sutton-Chen model and close-packed model, and their adsorption on defected graphene. The single-vacancy in graphene is found to enhance obviously the adsorption energy of Pt cluster on graphene due to the introduction of localized states near Fermi level. It is found that the close-packed model is more stable...
Near-surface GaAs/AlGaAs quantum wells, with and without a GaAs cap, have been used as effective probes of the electronic properties of oxidized GaAs surfaces and AlGaAs surfaces. We End that the variation of surface stoichiometry due to hydrogen ion treatments appears to be similar for both oxidized AlGaAs and GaAs surfaces, as examined by Auger electron spectroscopy. However, the composition of...
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