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

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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

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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.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2008
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 22 48.89%
2 image of flag of China China 8 17.78%
3 image of flag of United States United States 5 11.11%
4 image of flag of Singapore Singapore 2 4.44%
5 image of flag of France France 2 4.44%
6 image of flag of Vietnam Vietnam 1 2.22%
7 image of flag of Ukraine Ukraine 1 2.22%
8 image of flag of Taiwan Taiwan 1 2.22%
9 image of flag of Japan Japan 1 2.22%
10 image of flag of Canada Canada 1 2.22%
    other countries 1 2.22%

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