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Flower-Shaped Domains and Wrinkles in Trilayer Epitaxial Graphene on Silicon Carbide

B. Lalmi 1 J.C. Girard 1 E. Pallecchi 1 M. Silly 2 C. David 1 S. Latil 3 F. Sirotti 2 A. Ouerghi 1 
3 GMT - Groupe Modélisation et Théorie
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : Trilayer graphene is of particular interest to the 2D materials community because of its unique tunable electronic structure. However, to date, there is a lack of fundamental understanding of the properties of epitaxial trilayer graphene on silicon carbide. Here, following successful synthesis of large-area uniform trilayer graphene, atomic force microscopy (AFM) showed that the trilayer graphene on 6H-SiC(0001) was uniform over a large scale. Additionally, distinct defects, identified as flower-shaped domains and isolated wrinkle structures, were observed randomly on the surface using scanning tunneling microscopy and spectroscopy (STM/STS). These carbon nanostructures formed during growth, has different structural and electronic properties when compared with the adjacent flat regions of the graphene. Finally, using low temperature STM/STS at 4K, we found that the isolated wrinkles showed an irreversible rotational motion between two 60° configurations at different densities of states
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Submitted on : Tuesday, December 6, 2016 - 5:03:40 PM
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B. Lalmi, J.C. Girard, E. Pallecchi, M. Silly, C. David, et al.. Flower-Shaped Domains and Wrinkles in Trilayer Epitaxial Graphene on Silicon Carbide. Scientific Reports, Nature Publishing Group, 2014, 4, ⟨10.1038/srep04066⟩. ⟨cea-01410559⟩



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