Resolving the structure of the striped Ge layer on Ag ( 111 ) : Ag 2 Ge surface alloy with alternate fcc and hcp domains - Sorbonne Université Access content directly
Journal Articles Physical Review B Year : 2021

Resolving the structure of the striped Ge layer on Ag ( 111 ) : Ag 2 Ge surface alloy with alternate fcc and hcp domains

Abstract

Two-dimensional (2D) honeycomb lattices beyond graphene, such as germanene, promise new physical properties such as quantum spin Hall effect. While there have been many claims of growth of germanene, the lack of precise structural characterization of the epitaxial layers synthesized hinders further research. The striped layer formed by Ge deposition on Ag(111) has been recently ascribed as a stretched germanene layer. Using surface X-ray diffraction and density functional theory calculations, we demonstrate that it corresponds in fact to a Ag2Ge surface alloy with an atomic density 6.45% higher than the Ag(111) atomic density. The overall structure is formed by stripes associated with a face-centered cubic top-layer alignment, alternating with stripes associated with an hexagonal-close-packed top-layer alignment, in great analogy with the (22×√3) Au(111) reconstruction.
Fichier principal
Vignette du fichier
Zhang-2021-Resolving_the_structure.pdf (2.98 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03365882 , version 1 (05-10-2021)

Identifiers

Cite

K. Zhang, D. Sciacca, A. Coati, R. Bernard, Yves Borensztein, et al.. Resolving the structure of the striped Ge layer on Ag ( 111 ) : Ag 2 Ge surface alloy with alternate fcc and hcp domains. Physical Review B, 2021, 104 (15), ⟨10.1103/PhysRevB.104.155403⟩. ⟨hal-03365882⟩
97 View
42 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More