Details
| Original language | English |
|---|---|
| Article number | 165421 |
| Journal | Physical Review B |
| Volume | 97 |
| Issue number | 16 |
| Publication status | Published - 17 Apr 2018 |
Abstract
The plasmon dispersion is inherently related to the continuum of electron-hole pair excitations. Therefore, the comparison of this continuum, as derived from band structure calculations, with experimental data of plasmon dispersion, can yield direct information about the form of the occupied as well as the unoccupied band structure in the vicinity of the Fermi level. The relevance of this statement is illustrated by a detailed analysis of plasmon dispersions in quasi-one-dimensional systems combining experimental electron energy loss spectroscopy with quantitative density-functional theory (DFT) calculations. Si(557)-Au and Si(335)-Au with single atomic chains per terrace are compared with the Si(775)-Au system, which has a double Au chain on each terrace. We demonstrate that both hybridization between Si surface states and the Au chains as well as electronic correlations lead to increasing deviations from the nearly free electron picture that is suggested by a too simple interpretation of data of angular resolved photoemission (ARPES) of these systems, particularly for the double chain system. These deviations are consistently predicted by the DFT calculations. Thus also dimensional crossover can be explained.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B, Vol. 97, No. 16, 165421, 17.04.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Probing quasi-one-dimensional band structures by plasmon spectroscopy
AU - Lichtenstein, Timo
AU - Mamiyev, Zamin
AU - Braun, Christian
AU - Sanna, Simone
AU - Schmidt, Wolf Gero
AU - Tegenkamp, Christoph
AU - Pfnür, Herbert
N1 - Funding information: We gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft in the research unit FOR1700 and from the State of Lower Saxony within Niedersächsisches Graduiertenkolleg “Contact in Nanosystems” for a fellowship (Z.M.). All the calculations were performed at the Paderborn Center for Parallel Computing ( PC 2 ) and the High Performance Computing Center Stuttgart (HLRS).
PY - 2018/4/17
Y1 - 2018/4/17
N2 - The plasmon dispersion is inherently related to the continuum of electron-hole pair excitations. Therefore, the comparison of this continuum, as derived from band structure calculations, with experimental data of plasmon dispersion, can yield direct information about the form of the occupied as well as the unoccupied band structure in the vicinity of the Fermi level. The relevance of this statement is illustrated by a detailed analysis of plasmon dispersions in quasi-one-dimensional systems combining experimental electron energy loss spectroscopy with quantitative density-functional theory (DFT) calculations. Si(557)-Au and Si(335)-Au with single atomic chains per terrace are compared with the Si(775)-Au system, which has a double Au chain on each terrace. We demonstrate that both hybridization between Si surface states and the Au chains as well as electronic correlations lead to increasing deviations from the nearly free electron picture that is suggested by a too simple interpretation of data of angular resolved photoemission (ARPES) of these systems, particularly for the double chain system. These deviations are consistently predicted by the DFT calculations. Thus also dimensional crossover can be explained.
AB - The plasmon dispersion is inherently related to the continuum of electron-hole pair excitations. Therefore, the comparison of this continuum, as derived from band structure calculations, with experimental data of plasmon dispersion, can yield direct information about the form of the occupied as well as the unoccupied band structure in the vicinity of the Fermi level. The relevance of this statement is illustrated by a detailed analysis of plasmon dispersions in quasi-one-dimensional systems combining experimental electron energy loss spectroscopy with quantitative density-functional theory (DFT) calculations. Si(557)-Au and Si(335)-Au with single atomic chains per terrace are compared with the Si(775)-Au system, which has a double Au chain on each terrace. We demonstrate that both hybridization between Si surface states and the Au chains as well as electronic correlations lead to increasing deviations from the nearly free electron picture that is suggested by a too simple interpretation of data of angular resolved photoemission (ARPES) of these systems, particularly for the double chain system. These deviations are consistently predicted by the DFT calculations. Thus also dimensional crossover can be explained.
UR - http://www.scopus.com/inward/record.url?scp=85045921622&partnerID=8YFLogxK
U2 - 10.1103/physrevb.97.165421
DO - 10.1103/physrevb.97.165421
M3 - Article
AN - SCOPUS:85045921622
VL - 97
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 16
M1 - 165421
ER -