Double-pentagon silicon chains in a quasi-1D Si/Ag(001) surface alloy

Conor Hogan (), Andrea Sette, Vasil A. Saroka, Stefano Colonna, Roberto Flammini, Laurita Florean, Romain Bernard, Laurence Masson, Geoffroy Prévot and Fabio Ronci ()
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Conor Hogan: CNR-Istituto di Struttura della Materia (CNR-ISM)
Andrea Sette: Università di Roma “Tor Vergata”
Vasil A. Saroka: Università di Roma “Tor Vergata”
Stefano Colonna: CNR-Istituto di Struttura della Materia (CNR-ISM)
Roberto Flammini: CNR-Istituto di Struttura della Materia (CNR-ISM)
Laurita Florean: Sorbonne Université, CNRS-UMR 7588
Romain Bernard: Sorbonne Université, CNRS-UMR 7588
Laurence Masson: AMUtech
Geoffroy Prévot: Sorbonne Université, CNRS-UMR 7588
Fabio Ronci: CNR-Istituto di Struttura della Materia (CNR-ISM)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Silicon surface alloys and silicide nanolayers are highly important as contact materials in integrated circuit devices. Here we demonstrate that the submonolayer Si/Ag(001) surface reconstruction, reported to exhibit interesting topological properties, comprises a quasi-one-dimensional Si-Ag surface alloy based on chains of planar double-pentagon Si moieties. This geometry is determined using a combination of density functional theory calculations, scanning tunnelling microscopy, and grazing incidence x-ray diffraction simulations, and yields an electronic structure in excellent agreement with photoemission measurements. This work provides further evidence of pentagonal geometries in 2D materials and heterostructures and elucidates the importance of surface alloying in stabilizing their formation.

Date: 2024
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DOI: 10.1038/s41467-024-53589-4

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