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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

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Published on: September 23, 2018

Two dimensional Dirac carbon allotropes from graphene.

Li-Chun Xu¹, Ru-Zhi Wang, Mao-Sheng Miao

¹College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China. wrz@bjut.edu.cn miaoms@gmail.com limin.liu@csrc.ac.cn mym@jlu.edu.cn.

|December 4, 2013

Summary

Researchers discovered novel 2D carbon allotropes with Dirac cones, expanding the understanding of electronic structures beyond graphene. These findings reveal commonality of Dirac features in various carbon materials.

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Area of Science:

Materials Science
Condensed Matter Physics
Computational Chemistry

Background:

Graphene's unique electronic properties, including Dirac cones, have spurred interest in related 2D materials.
Exploring novel carbon allotropes is crucial for discovering new electronic and physical properties.

Purpose of the Study:

To discover new low-energy two-dimensional (2D) carbon allotropes.
To investigate the electronic structures and identify Dirac points in these novel materials.
To establish a general rule for designing 2D carbon allotropes with Dirac cones.

Main Methods:

Employed a structural search method combined with first-principles calculations.
Analyzed topological correlations among different graphene structures.
Utilized an Ising-like model to describe the energy order of the discovered allotropes.

Main Results:

Identified numerous low-energy 2D carbon allotropes, including three novel Dirac allotropes: S-graphene, D-graphene, and E-graphene.
Established a general rule for constructing 2D carbon allotropes with Dirac cones.
Designed new Dirac allotropes, some energetically more stable than previously reported ones.
Observed anisotropic electronic structures distinct from graphene.
Confirmed that sp and sp(3) hybridization do not preclude Dirac features.

Conclusions:

Dirac cones and linear carrier dispersion are common features in 2D carbon allotropes, not limited to graphene's fundamental structure.
The discovered allotropes and design rule offer new avenues for exploring advanced carbon-based electronic materials.