Cones, pringles, and grain boundary landscapes in graphene topology - Condensed Matter > Materials ScienceReport as inadecuate




Cones, pringles, and grain boundary landscapes in graphene topology - Condensed Matter > Materials Science - Download this document for free, or read online. Document in PDF available to download.

Abstract: A polycrystalline graphene consists of perfect domains tilted at angle{\alpha} to each other and separated by the grain boundaries GB. These nearlyone-dimensional regions consist in turn of elementary topological defects,5-pentagons and 7-heptagons, often paired up into 5-7 dislocations. EnergyG{\alpha} of GB computed for all range 0<={\alpha}<=Pi-3, shows a slightlyasymmetric behavior, reaching ~5 eV-nm in the middle, where the 5-s and 7-squalitatively reorganize in transition from nearly armchair to zigzaginterfaces. Analysis shows that 2-dimensional nature permits the off-planerelaxation, unavailable in 3-dimensional materials, qualitatively reducing theenergy of defects on one hand while forming stable 3D-landsapes on the other.Interestingly, while the GB display small off-plane elevation, the randomdistributions of 5-s and 7-s create roughness which scales inversely withdefect concentration, h ~ n^-1-2



Author: Yuanyue Liu, Boris I. Yakobson

Source: https://arxiv.org/



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