DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2017 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

DS: Fachverband Dünne Schichten

DS 26: Metallic Nanowires on Semiconductor Surfaces (jointly with O)

DS 26.1: 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 Pfnür11Institut 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.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden