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Strong covalent bonding between two graphene layers
- Source :
- Phys. Rev. B 77, 045403 (2008)
- Publication Year :
- 2007
-
Abstract
- We 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.<br />Comment: tar gzip latex 4 pages 4 figures
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 77, 045403 (2008)
- Publication Type :
- Report
- Accession number :
- edsarx.0707.4575
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.77.045403