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25 April 2024

» arxiv » 1212.4309

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Epitaxial Graphene Nanoribbons on Bunched Steps of a 6H-SiC(0001) Substrate: Aromatic Ring Pattern and Van Hove Singularities
M. Ridene ; T. Wassmann ; E. Pallecchi ; G. Rodary ; J. C. Girard ; A. Ouerghi1 ;
Date:	18 Dec 2012
Abstract:	We report scanning tunneling microscopy and spectroscopy investigation of graphene nanoribbons grown on an array of bunched steps of a 6H-SiC(0001) substrate. Our scanning tunneling microscopy images of a graphene nanoribbons on a step terrace feature a (sqrt(3)x sqrt(3))R30{deg} pattern of aromatic rings which define our armchair nanoribbons. This is in agreement to a simulation based on density functional theory. As another signature of the one-dimensional electronic structure, in the corresponding scanning tunneling spectroscopy spectra we find well developed, sharp Van Hove singularities.
Source:	arXiv, 1212.4309
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