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A simple tight-binding model for typical graphyne structures.
- Source :
-
New Journal of Physics . Nov2012, Vol. 14 Issue 11, p1-1. 1p. - Publication Year :
- 2012
-
Abstract
- A π-electronic tight-binding (TB) model with, at most, three independent parameters is found to well fit the density functional theory results about the dispersions of the conduction and valence bands of α-, β-, γ- and (6,6,12)-graphyne. By means of such a toy model, the electron–hole symmetry in these graphynes is demonstrated. An explicit expression of the dispersion relation of α-graphyne is obtained. The position of the Dirac point on a particular Γ–M line in the Brillouin zone of β-graphyne is analytically determined. The absence of Dirac cones in γ-graphyne is intuitively explained. Based on these interesting results, it is believed that this TB model provides a simple but effective theoretical approach for further study of the electronic and transport properties of these typical graphynes. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DENSITY functional theory
*DIRAC function
*GRAPHENE
*SYMMETRY
*BRILLOUIN zones
Subjects
Details
- Language :
- English
- ISSN :
- 13672630
- Volume :
- 14
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- New Journal of Physics
- Publication Type :
- Academic Journal
- Accession number :
- 98299395
- Full Text :
- https://doi.org/10.1088/1367-2630/14/11/113007