Strong covalent bonding between two graphene layers

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dc.creatorde Andres, P. L.
dc.creatorRamirez, R.
dc.creatorVerges, J. A.
dc.date2007-07-31
dc.date.accessioned2026-07-07T09:23:09Z
dc.date.available2026-07-07T09:23:09Z
dc.descriptionWe show that two graphene layers stacked directly on top of each other (AA stacking) form strong chemical bonds when the distance between planes is 0.156 nm. Simultaneously, C-C in-plane bonds are considerably weakened from partial double-bond (0.141 nm) to single bond (0.154 nm). This polymorphic form of graphene bilayer is meta-stable w.r.t. the one bound by van der Waals forces at a larger separation (0.335 nm) with an activation energy of 0.16 eV/cell. Similarly to the structure found in hexaprismane, C forms four single bonds in a geometry mixing 90^{0} and 120^{0} angles. Intermediate separations between layers can be stabilized under external anisotropic stresses showing a rich electronic structure changing from semimetal at van der Waals distance, to metal when compressed, to wide gap semiconductor at the meta-stable minimum.
dc.descriptiontar gzip latex 4 pages 4 figures
dc.identifierhttps://arxiv.org/abs/0707.4575
dc.identifierhttp://arxiv.org/abs/0707.4575
dc.identifierPhys. Rev. B 77, 045403 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.045403
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155632
dc.subjectMaterials Science
dc.titleStrong covalent bonding between two graphene layers
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