Anisotropic 2D metallicity: Plasmons in Ge(1 0 0)-Au

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Original languageEnglish
Article number175001
Number of pages7
JournalJournal of Physics Condensed Matter
Volume31
Issue number17
Publication statusPublished - 27 Feb 2019

Abstract

The low-energy plasmonic excitations of the Ge(0 0 1)-Au close to one monolayer coverage of Au were investigated by momentum-resolved high resolution electron energy loss spectroscopy. A very weak plasmonic loss was identifed dispersing along the chain direction of the c(8 × 2) formed at these Au coverages. The measured dispersion was compared with the Tomonaga-Luttinger-liquid (TLL) model and with a model for an anisotropic Fermi liquid. Using the TLL model both for single and arrays of wires, no consistent picture turned up that could describe all available data. On the contrary, a quasi-one-dimensional model of a confned 2D electron gas gave a satisfactorily consistent description of the data. From these results for the collective low-energy excitations we conclude that the Ge(0 0 1)-Au system is reasonably well described by a strongly anisotropic 2D Fermi liquid, but is incompatible with a TLL.

Keywords

    1D versus 2D, Low dimensional plasmons, screening

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Anisotropic 2D metallicity: Plasmons in Ge(1 0 0)-Au. / Lichtenstein, Timo; Mamiyev, Zamin; Jeckelmann, Eric et al.
In: Journal of Physics Condensed Matter, Vol. 31, No. 17, 175001, 27.02.2019.

Research output: Contribution to journalArticleResearchpeer review

Lichtenstein T, Mamiyev Z, Jeckelmann E, Tegenkamp C, Pfnür H. Anisotropic 2D metallicity: Plasmons in Ge(1 0 0)-Au. Journal of Physics Condensed Matter. 2019 Feb 27;31(17):175001. doi: 10.1088/1361-648x/ab02c5
Lichtenstein, Timo ; Mamiyev, Zamin ; Jeckelmann, Eric et al. / Anisotropic 2D metallicity : Plasmons in Ge(1 0 0)-Au. In: Journal of Physics Condensed Matter. 2019 ; Vol. 31, No. 17.
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title = "Anisotropic 2D metallicity: Plasmons in Ge(1 0 0)-Au",
abstract = "The low-energy plasmonic excitations of the Ge(0 0 1)-Au close to one monolayer coverage of Au were investigated by momentum-resolved high resolution electron energy loss spectroscopy. A very weak plasmonic loss was identifed dispersing along the chain direction of the c(8 × 2) formed at these Au coverages. The measured dispersion was compared with the Tomonaga-Luttinger-liquid (TLL) model and with a model for an anisotropic Fermi liquid. Using the TLL model both for single and arrays of wires, no consistent picture turned up that could describe all available data. On the contrary, a quasi-one-dimensional model of a confned 2D electron gas gave a satisfactorily consistent description of the data. From these results for the collective low-energy excitations we conclude that the Ge(0 0 1)-Au system is reasonably well described by a strongly anisotropic 2D Fermi liquid, but is incompatible with a TLL.",
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T2 - Plasmons in Ge(1 0 0)-Au

AU - Lichtenstein, Timo

AU - Mamiyev, Zamin

AU - Jeckelmann, Eric

AU - Tegenkamp, Christoph

AU - Pfnür, Herbert

N1 - Funding information: This work was supported by the Deutsche Forschungsgemeinschaft within Research Unit 1700, projects E4 and T2

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