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

• Verfasst von: Tzschoppe, Michael [VerfasserIn]
• Verfasst von: Huck, Christian [VerfasserIn]
• Verfasst von: Hötzel, Fabian [VerfasserIn]
• Verfasst von: Pucci, Annemarie [VerfasserIn]
• Titel: C70 increases the plasmonic signal of gold-atom chains on Si(553)
• Verf.angabe: Michael Tzschoppe, Christian Huck, Fabian Hötzel, Annemarie Pucci
• E-Jahr: 2018
• Jahr: 14 February 2018
• Umfang: 6 S.
• Fussnoten: Gesehen am 18.06.2019 ; Im Titel ist "70" tiefgestellt nach "C"
• Titel Quelle: Enthalten in: Surface science
• Ort Quelle: Amsterdam : Elsevier, 1964
• Jahr Quelle: 2018
• Band/Heft Quelle: 678(2018), Seite 32-37
• ISSN Quelle: 1879-2758
• DOI: doi:10.1016/j.susc.2018.02.007
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: C
• Sach-SW: Doping
• Sach-SW: Gold on Si(553)
• Sach-SW: Infrared spectroscopy
• Sach-SW: Plasmonic excitation
• K10plus-PPN: 1667617176

Abstract

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.