Competition for Graphene: Graphynes with Direction-Dependent Dirac Cones
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2012
- DOI:
- 10.1103/PhysRevLett.108.086804
- Bibcode:
- 2012PhRvL.108h6804M
- Keywords:
-
- 73.22.-f;
- 71.15.Mb;
- 73.61.Ph;
- Electronic structure of nanoscale materials: clusters nanoparticles nanotubes and nanocrystals;
- Density functional theory local density approximation gradient and other corrections;
- Polymers;
- organic compounds