Periodized Discrete Elasticity Models for Defects in Graphene Articles uri icon

publication date

  • August 2008

start page

  • 85406

issue

  • 8

volume

  • 78

international standard serial number (ISSN)

  • 1098-0121

electronic international standard serial number (EISSN)

  • 1538-4489

abstract

  • he 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.