Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/55140
Type: Artigo
Title: Atomic surface structure of graphene and its buffer layer on SiC(0001): a chemical-specific photoelectron diffraction approach
Author: Lima, L. H. de
Siervo, A. de
Landers, R.
Viana, G. A.
Goncalves, A. M. B.
Lacerda, R. G.
Häberle, P.
Abstract: We report a chemically specific x-ray photoelectron diffraction (XPD) investigation using synchrotron radiation of the thermally induced growth of epitaxial graphene on the 6H-SiC(0001). The XPD results show that the buffer layer on the SiC(0001) surface is formed by two domain regions rotated by 60◦ with respect to each other. The experimental data supported by a comprehensive multiple scattering calculation approach indicates the existence of a long-range ripple due the (6√3 × 6 √3)R30◦ reconstruction, in addition to a local range buckling in the (0001) direction of the two sublattices that form the honeycomb structure of the buffer layer. This displacement supports the existence of an sp2-to-sp3 rehybridization in this layer. For the subsequent graphene layer this displacement is absent, which can explain several differences between the electronic structures of graphene and the buffer layer.
We report a chemically specific x-ray photoelectron diffraction (XPD) investigation using synchrotron radiation of the thermally induced growth of epitaxial graphene on the 6H-SiC(0001). The XPD results show that the buffer layer on the SiC(0001) surface is formed by two domain regions rotated by 60◦ with respect to each other. The experimental data supported by a comprehensive multiple scattering calculation approach indicates the existence of a long-range ripple due the (6√3 × 6 √3)R30◦ reconstruction, in addition to a local range buckling in the (0001) direction of the two sublattices that form the honeycomb structure of the buffer layer. This displacement supports the existence of an sp2-to-sp3 rehybridization in this layer. For the subsequent graphene layer this displacement is absent, which can explain several differences between the electronic structures of graphene and the buffer layer.
Subject: Grafeno
Carboneto de silício
Espectroscopia fotoeletrônica
Country: Estados Unidos
Editor: American Physical Society
Citation: Physical Review B. Amer Physical Soc, v. 87, n. 8, 2013.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.87.081403
Address: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.87.081403
Date Issue: 2013
Appears in Collections:IFGW - Artigos e Outros Documentos

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