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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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
March 11, 2019
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| In: |
The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2019, Jahrgang: 123, Heft: 14, Pages: 9400-9406 |
| ISSN: | 1932-7455 |
| DOI: | 10.1021/acs.jpcc.9b01372 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1021/acs.jpcc.9b01372
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| Verfasserangaben: | Zamin Mamiyev, Michael Tzschoppe, Christian Huck, Annemarie Pucci, and Herbert Pfnür |
| Zusammenfassung: | 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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| Beschreibung: | Gesehen am 21.05.2019 |
| Beschreibung: | Online Resource |
| ISSN: | 1932-7455 |
| DOI: | 10.1021/acs.jpcc.9b01372 |