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Plasmon standing waves by oxidation of Si(553)–Au

Self-assembled Au atomic wires on stepped Si surfaces are metallic, as evidenced by one-dimensionally dispersing plasmonic excitation. Here, we investigate the effects of oxidation on metallicity along such Au atomic wires on a regularly stepped Si(553) surface by employing infrared absorption and h...

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Main Authors: Mamiyev, Zamin (Author) , Tzschoppe, Michael (Author) , Huck, Christian (Author) , Pucci, Annemarie (Author)
Format: Article (Journal)
Language:English
Published: March 11, 2019
In: The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2019, Volume: 123, Issue: 14, Pages: 9400-9406
ISSN:1932-7455
DOI:10.1021/acs.jpcc.9b01372
Online Access:Verlag, Volltext: https://doi.org/10.1021/acs.jpcc.9b01372
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Author Notes:Zamin Mamiyev, Michael Tzschoppe, Christian Huck, Annemarie Pucci, and Herbert Pfnür

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520 |a Self-assembled Au atomic wires on stepped Si surfaces are metallic, as evidenced by one-dimensionally dispersing plasmonic excitation. Here, we investigate the effects of oxidation on metallicity along such Au atomic wires on a regularly stepped Si(553) surface by employing infrared absorption and high-resolution electron energy loss spectroscopies. Our results indicate that only the Si environment undergoes oxidation, which has a remarkably small effect on the plasmon dispersion. However, close to k∥ → 0 the plasmon dispersion starts at increasingly higher energies as a function of oxygen exposure, which is attributed to standing wave formation on small sections of Au wires generated by the introduction of O atoms as scattering centers, not to electronic gap opening. This interpretation is in full agreement with the findings by infrared spectroscopy and low-energy electron diffraction. 
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