2016/05/05 by Dmytro Solonenko, Solonenko, Dmytro, Ovidiu D. Gordan +7
Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #FOS: Physical sciences #Graphene research and applications #Materials Science (cond-mat.mtrl-sci) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.1605.01593
openalex publication_date 2016/05/05 · openalex created_date 2022/09/16 · openalex updated_date 2026/07/28
The two-dimensional silicon allotrope, silicene, could spur the development\nof new and original concepts in Si-based nanotechnology. Up to now silicene can\nonly be epitaxially synthesized on a supporting substrate such as Ag(111). Even\nthough the structural and electronic properties of these epitaxial silicene\nlayers have been intensively studied, very little is known about its\nvibrational characteristics. Here, we present a detailed study of epitaxial\nsilicene on Ag(111) using \in situ Raman spectroscopy, which is one of\nthe most extensively employed experimental techniques to characterize 2D\nmaterials, such as graphene, transition metal dichalcogenides, and black\nphosphorous. The vibrational fingerprint of epitaxial silicene, in contrast to\nall previous interpretations, is characterized by three distinct phonon modes\nwith A and E symmetries. The temperature dependent spectral evolution of these\nmodes demonstrates unique thermal properties of epitaxial silicene and a\nsignificant electron-phonon coupling. These results unambiguously support the\npurely two-dimensional character of epitaxial silicene up to about\n300\∘C, whereupon a 2D-to-3D phase transition takes place.\n