SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster: 2D Materials II
O 36.6: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Silicene’s pervasive surface alloy on Ag(111) — Johannes T Küchle1,2, Aleksandr Baklanov1, Ari P Seitsonen3,4, Paul TP Ryan2,5, Peter Feulner1, Prashanth Pendem1, Tien-Lin Lee2, Matthias Muntwiler6, Martin Schwarz1, Felix Haag1, Johannes V Barth1, Willi Auwärter1, •David A Duncan1,2, and Francesco Allegretti1 — 1Physics Department E20, Technische Universität München, Deutschland — 2Diamond Light Source, Oxfordshire, UK — 3Département de Chimie, École Normale Supérieure, Paris, France — 4Université Paris Sciences et Lettres, Sorbonne Université, Paris, France — 5Imperial College London, UK — 6Paul Scherrer Institut, Villigen, Switzerland
Silicene is the two-dimensional (2D) allotrope of silicon. So far, the most direct synthesis strategy has been to grow it epitaxially on metal surfaces; however, the effect of the strong silicon-metal interaction on the structure and electronic properties of the metal-supported silicene is generally poorly understood. Here, we consider the ( 4 × 4 )-silicene monolayer (ML) grown on Ag(111), and show that our experimental results refute the common interpretation of this system as a simple buckled, honeycomb ML with a sharp interface to the Ag substrate. Instead, we demonstrate the pervasive presence of a second silicon species, concluded to be a Si/Ag alloy stacked between the 2D silicene and the silver substrate. These findings question the current structural understanding of the silicene/Ag(111) interface and may raise expectations of analogous alloy systems in the stabilization of other 2D materials grown epitaxially on metal surfaces.