Pisarra, M. and Bernardo Gavito, Ramon and Navarro, Juan Jesús and Black, Andrés and Diaz, Cristina and Calleja, Fabián and Granados, Daniel and Miranda, Rodolfo and Martin, Fernando and Vázquez De Parga, Amadeo L. (2018) Coverage evolution of the unoccupied Density of States in sulfur superstructures on Ru(0001). Applied Surface Science, 433. pp. 300-305. ISSN 0169-4332
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Abstract
Sulfur adsorbed on Ru(0001) presents a large number of ordered structures. This characteristic makes S/Ru(0001) the ideal system to investigate the effect of different periodicities on the electronic properties of interfaces. We have performed scanning tunneling microscopy/spectroscopy experiments and density functional theory calculations showing that a sulfur adlayer generates interface states inside the Γ directional gap of Ru(0001) and that the position of such states varies monotonically with sulfur coverage. This is the result of the interplay between band folding effects arising from the new periodicity of the system and electron localization on the sulfur monolayer. As a consequence, by varying the amount of sulfur in S/Ru(0001) one can control the electronic properties of these interfacial materials.