Dresden 2014 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 45: Poster IV: One-Dimensional Metals: Reality or Fiction

DS 45.24: Poster

Donnerstag, 3. April 2014, 16:00–19:00, P1

Tuning of 1d plasmons via selective doping at the edges — •Ulrich Krieg, Timo Lichtenstein, Heiko Teiken, Christoph Tegenkamp, and Herbert Pfnür — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany

We prepared Ag-√3 nanowires on the regularly stepped Si(557) surface via self assembly. These wires are of monoatomic height and have an average width of 3.6 nm. Using the intrinsic semiconducting nature of the Ag-√3 phase we recently showed that it is possible to tune the 1d plasmon dispersion in a wide range by adsorption of additional silver atoms [1]. This leads to a 1d metallic surface. Using an electron loss spectrometer (EELS) with simultaneous high energy and momentum (k_||) resolution and SPA-LEED we found strong evidence that the silver doping process is indeed not due to a silver adatom gas, as seen on Ag-√3 on Si(111), but due to chemical adsorption of silver atoms at the step edges. This is compatible with the saturation coverage of 0.12ML and the temperature independence of the plasmon energy.

[1] Krieg U, Zhang Y, Tegenkamp C and Pfnür H 2013 arXiv:1308.5591