Clar sextet analysis of triangular, rectangular, and honeycomb graphene antidot lattices

René Petersen, Thomas Garm Pedersen*, Antti Pekka Jauho

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

85 Citations (Scopus)

Abstract

Pristine graphene is a semimetal and thus does not have a band gap. By making a nanometer scale periodic array of holes in the graphene sheet a band gap may form; the size of the gap is controllable by adjusting the parameters of the lattice. The hole diameter, hole geometry, lattice geometry, and the separation of the holes are parameters that all play an important role in determining the size of the band gap, which, for technological applications, should be at least of the order of tenths of an eV. We investigate four different hole configurations: the rectangular, the triangular, the rotated triangular, and the honeycomb lattice. It is found that the lattice geometry plays a crucial role for size of the band gap: the triangular arrangement displays always a sizable gap, while for the other types only particular hole separations lead to a large gap. This observation is explained using Clar sextet theory, and we find that a sufficient condition for a large gap is that the number of sextets exceeds one-third of the total number of hexagons in the unit cell. Furthermore, we investigate nonisosceles triangular structures to probe the sensitivity of the gap in triangular lattices to small changes in geometry.

Original languageEnglish
Pages (from-to)523-529
Number of pages7
JournalACS Nano
Volume5
Issue number1
DOIs
Publication statusPublished - 25 Jan 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Antidots
  • Band gap
  • Band structure
  • Clar sextets
  • Graphene

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