2016/05/16 by Alexandre Artaud, A. Artaud, L. Magaud +11 · 60 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Boron and Carbon Nanomaterials Research #Density functional theory #Electronic band structure #Formalism (music) #Graphene #Graphene nanoribbons #Graphene research and applications #Hexagonal crystal system #Scanning tunneling microscope #Superlattice #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1038/srep25670
published in Scientific Reports 6(1), 25670 (Nature Portfolio) · 14 pages, 6 figures
openalex publication_date 2016/05/16 · arxiv created 2016/05/24 · arxiv updated 2016/06/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Moiré superlattices in graphene supported on various substrates have opened a new avenue to engineer graphene's electronic properties. Yet, the exact crystallographic structure on which their band structure depends remains highly debated. In this scanning tunneling microscopy and density functional theory study, we have analysed graphene samples grown on multilayer graphene prepared onto SiC and on the close-packed surfaces of Re and Ir with ultra-high precision. We resolve small-angle twists and shears in graphene, and identify large unit cells comprising more than 1,000 carbon atoms and exhibiting non-trivial nanopatterns for moiré superlattices, which are commensurate to the graphene lattice. Finally, a general formalism applicable to any hexagonal moiré is presented to classify all reported structures.