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Open Access Nano Express

Dirac cone in α -graphdiyne: a first-principles study

Xiaoning Niu, Xingze Mao, Dezheng Yang, Zhiya Zhang, Mingsu Si* and Desheng Xue

Author affiliations

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China

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Citation and License

Nanoscale Research Letters 2013, 8:469  doi:10.1186/1556-276X-8-469

Published: 9 November 2013

Abstract

We investigate the Dirac cone in α-graphdiyne, which is a predicted flat one-atom-thick allotrope of carbon using first-principles calculations. α-graphdiyne is derived from graphene where two acetylenic linkages (-C ≡C-) are inserted into the single bonds (-C-C-). Thus, α-graphdiyne possesses a larger lattice constant which subsequently affects its electronic properties. Band structures show that α-graphdiyne exhibits similar Dirac points and cone to graphene. Further, the tight-binding method is used to exploit the linear dispersion in the vicinity of Dirac points. Thanks to the larger lattice constant, α-graphdiyne yields a lower Fermi velocity, which might make itself an ideal material to serve the anomalous integer quantum Hall effect.

Keywords:
α-graphdiyne; Dirac cone; First-principles calculation