Experimental investigation of two-dimensional plasmons in a DySi 2 monolayer on Si(111)

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dc.identifier.uri http://dx.doi.org/10.15488/2778
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2804
dc.contributor.author Rugeramigabo, Eddy P.
dc.contributor.author Nagao, T.
dc.contributor.author Pfnür, Herbert
dc.date.accessioned 2018-02-19T14:27:03Z
dc.date.available 2018-02-19T14:27:03Z
dc.date.issued 2008
dc.identifier.citation Rugeramigabo, E.P.; Nagao, T.; Pfnür, H.: Experimental investigation of two-dimensional plasmons in a DySi 2 monolayer on Si(111). In: Physical Review B 78 (2008), Nr. 15, 155402. DOI: https://doi.org/10.1103/PhysRevB.78.155402
dc.description.abstract DySi2 monolayers were prepared by thermal evaporation of Dy at room temperature followed by annealing to 500°C on Si(111), which yields a perfect (1×1) low-energy electron diffraction pattern. These monolayers of DySi2 were investigated by electron energy loss spectroscopy with both high energy and momentum resolution. A low-energy acoustic-like dispersion was found with very small anisotropy in reciprocal space, consistent with the characteristic losses due to a two-dimensional plasmon in the hexagonal monolayer structure of DySi2, and effective hole densities of N2d =4.1× 1013 cm-2 with an effective mass of m* =0.37 me. Deviations of the expected dispersion due to single-particle excitations in the Si substrate were found above q∥ =0.08 Å-1. On (111) facets with terrace widths of 12 lattice constants, these properties change little along the terraces, but no plasmon wave propagation across step edges is possible, leading to strong suppression of characteristic loss signals in the direction normal to the steps. © 2008 The American Physical Society. eng
dc.language.iso eng
dc.publisher College Park, MD : American Physical Society
dc.relation.ispartofseries Physical Review B 78 (2008), Nr. 15
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject electron energy loss spectroscopy eng
dc.subject monolayer eng
dc.subject.ddc 530 | Physik ger
dc.title Experimental investigation of two-dimensional plasmons in a DySi 2 monolayer on Si(111)
dc.type article
dc.type Text
dc.relation.issn 10980121
dc.relation.doi https://doi.org/10.1103/PhysRevB.78.155402
dc.bibliographicCitation.issue 15
dc.bibliographicCitation.volume 78
dc.bibliographicCitation.firstPage 155402
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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