Skip to Main content Skip to Navigation
Journal articles

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.
Complete list of metadata

https://hal.sorbonne-universite.fr/hal-03365882
Contributor : Yves Borensztein Connect in order to contact the contributor
Submitted on : Tuesday, October 5, 2021 - 2:13:07 PM
Last modification on : Tuesday, November 16, 2021 - 5:09:21 AM

File

Zhang-2021-Resolving_the_struc...
Files produced by the author(s)

Identifiers

Citation

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, American Physical Society, 2021, 104 (15), ⟨10.1103/PhysRevB.104.155403⟩. ⟨hal-03365882⟩

Share

Metrics

Record views

68

Files downloads

42