Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Metallic Nanowires on Semiconductor Surfaces

O 54.1: Poster

Tuesday, March 21, 2017, 18:30–20:30, P1C

Quasi-one-dimensional plasmons in Si(hhk)-Au: a crossover of dimensions — •Timo Lichtenstein¹, Zamin Mamiyev¹, Marvin Detert¹, Julian Aulbach², Jörg Schäfer², Christoph Tegenkamp¹, and Herbert Pfnür¹ — ¹Institut für Festkörperphysik, Leibniz Universität Hannover — ²Physikalisches Institut and RCCM, Universität Würzburg

For future plasmonic devices one-dimensional (1d) plasmons offer unique properties: an inherently predetermined direction, a wavelength much shorter than those of photons, and an almost linear dispersion. Au induced wires on regularly stepped Si(hhk) are a playground for quasi-1d structures. Therefore, they were prepared at coverages where the surfaces host single or double atomic gold chains parallel to the steps. This allows studying the influence of spacing and wire width. The wire quality was checked with spot profile analysis in low energy electron diffraction, in combination with an electron energy loss spectrometer providing both high energy and momentum resolution it gave access to the plasmon dispersion. Although 1d metallicity is observed, the plasmon dispersion strongly depends on two-dimensional properties: the lateral distribution of the 1d electron density within one terrace (intrawire correlation) and the spacing of the wires (interwire correlation). We obtained effective widths considerably smaller than the terrace width. A quantitative description is possible by a modified wire array plasmon model, claiming extensions of theory. Also, STM gives a modulated DOS of comparable width. Both the chain type as well as the terrace size seem to be of influence.