Details

Autor(en) / Beteiligte

• Kotlyar, V.G.
• Utas, O.A.
• Utas, T.V.
• Bondarenko, L.V.
• Tupchaya, A.Y.
• Gruznev, D.V.
• Mihalyuk, A.N.
• Zotov, A.V.
• Saranin, A.A.

Titel

Surface reconstructions in Pb/Si(100) system: Composition and atomic arrangement

Ist Teil von

• Surface science, 2020-05, Vol.695, p.121574, Article 121574

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Surface reconstructions in Pb/Si(100) system were studied using STM observations and DFT calculations.•Established Pb coverages are 0.5, 0.75, 1.5 and  2.0 (15/8) ML for 2 × 2, c(8 × 4), 2 × 1 and c(4 × 4), respectively.•Using AIRSS analysis, structural models were proposed for each reconstruction.•The obtained data set provides a solid basis for prospective investigations of Pb/Si(100) system. [Display omitted] Using scanning tunneling microscopy and density functional theory calculations, atomic arrangement of surface reconstructions in Pb/Si(100) system was examined. Through accurate evaluation of Pb coverage, it was determined that 2 × 2 reconstruction contains 0.5 monolayer (ML) of Pb, c(8 × 4) - 0.75 ML of Pb, 2 × 1 - 1.5 ML of Pb, and c(4 × 4) - 1.875 (15/8) ML of Pb. It was revealed that the 2 × 2-Pb reconstruction can occur in two possible modifications, with buckled Pb dimers in the trenches between Si-dimer rows and with symmetric Pb dimers atop Si-dimer rows. The 2 × 2-Pb reconstruction of the latter type develops mainly on the Si(100)2 × 1 surface which contains relatively large density of structural defects. Known structural models of the c(8 × 4) and 2 × 1 reconstructions were tested and received the confirmation. A new model was proposed for the c(4 × 4) structure. The obtained data set is believed to constitute a solid base for the prospective studies of the phenomena occurring in the Pb/Si(100) system. In particular, the Pb-dense reconstructions, 2 × 1 and c(4 × 4), might be plausible candidates for detecting superconducting properties by analogy with the Pb-dense reconstructions on Si(111).