Group theoretical methods to construct the graphene

TL;DR

This paper explores six group-theoretic methods to generate and analyze the structure of graphene, including coloring and phase transitions, based on projections from Lie algebra weight systems.

Contribution

It introduces six novel group-theoretic approaches to construct and study graphene structures, including coloring and phase transitions, from Lie algebra projections.

Findings

Six methods to generate graphene using Lie algebra projections

Descriptions of coloring and phase transitions in graphene

Multistep refinement processes for graphene structures

Abstract

In this paper, the tiling of the Euclidean plane with regular hexagons whose vertices are occupied by carbon atoms is called the graphene. We describe six different ways to generate the graphene by the means of group theory. There are two ways starting from the triangular lattice of Lie algebra $A_2$ and $G_2$, and one way for each of the Lie algebras $B_3$, $C_3$ and $A_3$, by projecting the weight system of their lowest representation to the hexagons of $A_2$. Colouring of the graphene is presented. Changing from one colouring to another is called phase transition. Multistep refinements of the graphene are described.