Details
| Original language | English |
|---|---|
| Article number | 075438 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 7 |
| Publication status | Published - 24 Aug 2020 |
Abstract
Si(111)-(5×2)-Au represents a prototype system for an adsorbate-induced spontaneous symmetry break by formation of quasi-one-dimensional atomic chains that are metallic. Surprisingly, the geometric structure of these chains is still under debate. In this paper, we show that examination of the unoccupied band structure by plasmon spectroscopy in combination with low energy electron diffraction contains sufficient information to discriminate between suggested models, favoring an optimal concentration of 6 atoms per (5×2) unit cell. Furthermore, we tested the stability of this structure and found that higher concentrations of Au tend to destabilize the single-domain structure on the slightly misoriented Si(111) surface, favoring formation of (3×3)R30-ordered islands with a local concentration of 1 ML already at a surplus of 0.08 ML. The precise role of Au atoms at concentrations exceeding 0.60 ML that seem to stabilize formation of three domains, however, must remain open.
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. 102, No. 7, 075438, 24.08.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - View on Si(111)−(5×2)−Au with plasmon spectroscopy
AU - Mamiyev, Z.
AU - Pfnür, H.
N1 - Funding information: We gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft (Project No. TE386/10-2) in the research unit FOR 1700 and from Niedersächsisches Ministerium für Wissenschaft und Kultur through the graduate school “Contacts in Nanosystems.”
PY - 2020/8/24
Y1 - 2020/8/24
N2 - Si(111)-(5×2)-Au represents a prototype system for an adsorbate-induced spontaneous symmetry break by formation of quasi-one-dimensional atomic chains that are metallic. Surprisingly, the geometric structure of these chains is still under debate. In this paper, we show that examination of the unoccupied band structure by plasmon spectroscopy in combination with low energy electron diffraction contains sufficient information to discriminate between suggested models, favoring an optimal concentration of 6 atoms per (5×2) unit cell. Furthermore, we tested the stability of this structure and found that higher concentrations of Au tend to destabilize the single-domain structure on the slightly misoriented Si(111) surface, favoring formation of (3×3)R30-ordered islands with a local concentration of 1 ML already at a surplus of 0.08 ML. The precise role of Au atoms at concentrations exceeding 0.60 ML that seem to stabilize formation of three domains, however, must remain open.
AB - Si(111)-(5×2)-Au represents a prototype system for an adsorbate-induced spontaneous symmetry break by formation of quasi-one-dimensional atomic chains that are metallic. Surprisingly, the geometric structure of these chains is still under debate. In this paper, we show that examination of the unoccupied band structure by plasmon spectroscopy in combination with low energy electron diffraction contains sufficient information to discriminate between suggested models, favoring an optimal concentration of 6 atoms per (5×2) unit cell. Furthermore, we tested the stability of this structure and found that higher concentrations of Au tend to destabilize the single-domain structure on the slightly misoriented Si(111) surface, favoring formation of (3×3)R30-ordered islands with a local concentration of 1 ML already at a surplus of 0.08 ML. The precise role of Au atoms at concentrations exceeding 0.60 ML that seem to stabilize formation of three domains, however, must remain open.
UR - http://www.scopus.com/inward/record.url?scp=85093094396&partnerID=8YFLogxK
U2 - 10.1103/physrevb.102.075438
DO - 10.1103/physrevb.102.075438
M3 - Article
VL - 102
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 7
M1 - 075438
ER -