Novel Two-dimensional Carbon Allotrope with Strong Electronic Anisotropy

Abstract

Two novel two-dimensional carbon allotropes comprised of octagons and pentagons are proposed based on the first-principles calculations. The two carbon allotropes, named OPG-L and OPG-Z, are found to have distinct properties. OPG-L is metallic, while OPG-Z is a gapless semimetal. Remarkably, OPG-Z exhibits pronounced electronic anisotropy with highly anisotropic Dirac points at the Fermi level. A tight-binding model is suggested to describe the low-energy quasiparticles, which clarifies the origin of the anisotropic Dirac points. Such an anisotropic electronic characteristic of OPG-Z is expected to have wide implications in nano-electronics.

6 pages, 5 figures (accepted by Physical Review B)

References in corpus (10)

• The electronic properties of graphene
• Control of graphene's properties by reversible hydrogenation
• Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
• Graphane: a two-dimensional hydrocarbon
• From Point Defects in Graphene to Two-Dimensional Amorphous Carbon
• Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
• Graphene valley filter using a line defect
• Octagraphene as a Versatile Carbon Atomic Sheet for Novel Nanotubes, Unconventional Fullerenes and Hydrogen Storage
• A Two-Dimensional Carbon Semiconductor
• One-dimensional quantum channel in a graphene line defect

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• Theoretical prediction of a low-energy Stone-Wales graphene with intrinsic type-III Dirac-cone
• Competing dynamics of single phosphorus dopant in graphene with electron irradiation
• Solving Optimization Problems through Fully Convolutional Networks: an Application to the Travelling Salesman Problem
• Stabilities and novel electronic structures of three carbon nitride bilayers
• Emergence of Type-I and Type-II Dirac line nodes in penta-octa-graphene