Competition for Graphene: Graphynes with Direction-Dependent Dirac Cones
Daniel MalkoLehrstuhl für Theoretische Chemie and Interdisciplinary Center of Molecular Materials, Universität Erlangen-Nürnberg, Erlangen, GermanyChristian NeißLehrstuhl für Theoretische Chemie and Interdisciplinary Center of Molecular Materials, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, GermanyFrancesc ViñesLehrstuhl für Theoretische Chemie and Interdisciplinary Center of Molecular Materials, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, GermanyAndreas GörlingLehrstuhl für Theoretische Chemie and Interdisciplinary Center of Molecular Materials, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany
2012en
ABI
Аннотация
The existence of Dirac cones in the band structure of two-dimensional materials accompanied by unprecedented electronic properties is considered to be a unique feature of graphene related to its hexagonal symmetry. Here, we present other two-dimensional carbon materials, graphynes, that also possess Dirac cones according to first-principles electronic structure calculations. One of these materials, 6,6,12-graphyne, does not have hexagonal symmetry and features two self-doped nonequivalent distorted Dirac cones suggesting electronic properties even more amazing than that of graphene.
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