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Periodized discrete elasticity models for defects in graphene

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Carpio, Ana y Bonilla, L.L. (2008) Periodized discrete elasticity models for defects in graphene. Physical review B, 78 (8). ISSN 1098-0121

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URL Oficial: http://arxiv.org/pdf/0805.1220.pdf


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Resumen

The cores of edge dislocations, edge dislocation dipoles, and edge dislocation loops in planar graphene have been studied by means of periodized discrete elasticity models. To build these models, we have found a way to discretize linear elasticity on a planar hexagonal lattice using combinations of difference operators that do not symmetrically involve all the neighbors of an atom. At zero temperature, dynamically stable cores of edge dislocations may be heptagon-pentagon pairs (glide dislocations) or octagons (shuffle dislocations) depending on the choice of initial configuration. Possible cores of edge dislocation dipoles are vacancies, pentagon-octagon-pentagon divacancies, Stone-Wales defects, and 7-5-5-7 defects. While symmetric vacancies, divacancies, and 7-5-5-7 defects are dynamically stable, asymmetric vacancies and 5-7-7-5 Stone-Wales defects seem to be unstable.


Tipo de documento:Artículo
Palabras clave:Carbon nanotubes; Graphite; Dislocations; Crystals
Materias:Ciencias > Física > Física del estado sólido
Código ID:14933
Depositado:20 Abr 2012 11:31
Última Modificación:28 Oct 2016 08:27

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