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arXiv · 1903.04826

Plasmon Standing Waves by Oxidation of Si(553)-Au

Z. Mamiyev·M. Tzschoppe·C. Huck·A. Pucci·H. Pfnür
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Abstract

Self-assembled Au atomic wires on stepped Si surfaces are metallic, as evidenced by a one-dimensionally dispersing plasmonic excitation. Here we investigate the effects of oxidization 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. Only close to $k_{\parallel}\rightarrow 0$ the plasmon dispersion ends 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 with low energy electron diffraction.

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Z. Mamiyev, M. Tzschoppe, C. Huck, A. Pucci, H. Pfnür. 2019-03-12. Plasmon Standing Waves by Oxidation of Si(553)-Au. https://doi.org/10.1021/acs.jpcc.9b01372

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