C70 increases the plasmonic signal of gold-atom chains on Si(553)

Infrared plasmonic excitations of the quasi-one dimensional gold-atom induced superstructures on silicon surfaces are particularly sensitive to doping effects. Such effects, here related to C70 adsorption, can be clearly measured as we show for gold atom chains on the Si(553) surface at room tempera...

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Hauptverfasser: Tzschoppe, Michael (VerfasserIn) , Huck, Christian (VerfasserIn) , Hötzel, Fabian (VerfasserIn) , Pucci, Annemarie (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 14 February 2018
In: Surface science
Year: 2018, Jahrgang: 678, Pages: 32-37
ISSN:1879-2758
DOI:10.1016/j.susc.2018.02.007
Online-Zugang:Verlag, Volltext: https://doi.org/10.1016/j.susc.2018.02.007
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0039602817308063
Volltext
Verfasserangaben:Michael Tzschoppe, Christian Huck, Fabian Hötzel, Annemarie Pucci

MARC

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520 |a Infrared plasmonic excitations of the quasi-one dimensional gold-atom induced superstructures on silicon surfaces are particularly sensitive to doping effects. Such effects, here related to C70 adsorption, can be clearly measured as we show for gold atom chains on the Si(553) surface at room temperature. The strong plasmonic signal that is exclusively present for polarization along the chain direction does not disappear under C70 exposure. In contrast, it increases for adsorption of the first monolayer. The rising intensity corresponds to an increase of the one-dimensional plasma frequency. This process saturates at a coverage corresponding to ca. one C70 per 1×2 surface unit cell. The observed plasmonic behaviour upon C70 adsorption is opposite to the consequences of electron donating gold ad-atoms on the plasmonic response. The increase of the one-dimensional plasma frequency upon C70 adsorption is accompanied by an increase of the electronic scattering rate, which is in accord to the theory on adsorbate induced surface resistivity. 
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