Details
| Original language | English |
|---|---|
| Article number | 175001 |
| Number of pages | 7 |
| Journal | Journal of Physics Condensed Matter |
| Volume | 31 |
| Issue number | 17 |
| Publication status | Published - 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
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of Physics Condensed Matter, Vol. 31, No. 17, 175001, 27.02.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Anisotropic 2D metallicity
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
PY - 2019/2/27
Y1 - 2019/2/27
N2 - 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.
AB - 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.
KW - 1D versus 2D
KW - Low dimensional plasmons
KW - screening
UR - http://www.scopus.com/inward/record.url?scp=85062878850&partnerID=8YFLogxK
U2 - 10.1088/1361-648x/ab02c5
DO - 10.1088/1361-648x/ab02c5
M3 - Article
C2 - 30695765
AN - SCOPUS:85062878850
VL - 31
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 17
M1 - 175001
ER -