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Metallic thin films on stepped surfaces: lateral scattering of quantum well states

AuthorsSchiller, Frederik CSIC ORCID; Abd El-Fattah, Z. M. CSIC ORCID; Schirone, S. CSIC ORCID; Lobo-Checa, Jorge CSIC ORCID ; Urdanpilleta, Marta; Ruiz-Osés, Miguel; Cordón, J.; Corso, Martina CSIC ORCID ; Sánchez-Portal, Daniel CSIC ORCID ; Mugarza, Aitor CSIC ORCID; Ortega, J. Enrique CSIC ORCID
Issue Date2014
PublisherInstitute of Physics Publishing
CitationNew Journal of Physics 16(12): 123025-123039 (2014)
AbstractQuantum well states of Ag films grown on stepped Au(111) surfaces are shown to undergo lateral scattering, in analogy with surface states of vicinal Ag(111). Applying angle resolved photoemission spectroscopy we observe quantum well bands with zone-folding and gap openings driven by surface/interface step lattice scattering. Experiments performed on a curved Au(111) substrate allow us to determine a subtle terrace-size effect, i.e., a fine step-density-dependent upward shift of quantum well bands. This energy shift is explained as mainly due to the periodically stepped crystal potential offset at the interface side of the film. Finally, the surface state of the stepped Ag film is analyzed with both photoemission and scanning tunneling microscopy. We observe that the stepped film interface also affects the surface state energy, which exhibits a larger terrace-size effect compared to surface states of bulk vicinal Ag(111)crystals.
DescriptionContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
Publisher version (URL)http://dx.doi.org/10.1088/1367-2630/16/12/123025
Identifiersdoi: 10.1088/1367-2630/16/12/123025
issn: 1367-2630
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