Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/15804

TítuloZigzag graphene nanoribbon edge reconstruction with stone-wales defects
Autor(es)Rodrigues, João N. B.
Gonçalves, Paulo André Dias
Rodrigues, N. F. G.
Ribeiro, R. M.
Santos, J. M. B. Lopes dos
Peres, N. M. R.
Palavras-chaveGraphene
Nanoribbons
Stone-Wales defects
edge reconstruction
Data2011
EditoraAmerican Physical Society
RevistaPhysical Review B: Condensed Matter and Materials Physics
Resumo(s)In this paper, we study zigzag graphene nanoribbons with edges reconstructed with Stone-Wales defects, by means of an empirical (first-neighbor) tight-binding method, with parameters determined by ab initio calculations of very narrow ribbons. We explore the characteristics of the electronic band structure with a focus on the nature of edge states. Edge reconstruction allows the appearance of a new type of edge states. They are dispersive, with nonzero amplitudes in both sublattices; furthermore, the amplitudes have two components that decrease with different decay lengths with the distance from the edge; at the Dirac points one of these lengths diverges, whereas the other remains finite, of the order of the lattice parameter. We trace this curious effect to the doubling of the unit cell along the edge, brought about by the edge reconstruction. In the presence of a magnetic field, the zero-energy Landau level is no longer degenerate with edge states as in the case of the pristine zigzag ribbon.
Tipoarticle
URIhttp://hdl.handle.net/1822/15804
DOI10.1103/PhysRevB.84.155435
ISSN1098-0121
e-ISSN1550-235X
Versão da editorahttp://www.aps.org/
Arbitragem científicayes
AcessoopenAccess
Aparece nas coleções:CDF - CEP - Artigos/Papers (with refereeing)

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