Armchair graphene nanoribbons: Electronic structure and electric field modulation

Details Armchair graphene nanoribbons: Electronic structure and electric field modulation Armchair graphene nanoribbons: Electronic structure and electric field modulation

2008-03-08

arxiv.org/abs/0803.1233v4

Phys. Rev. B 77, 245434 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.77.245434

We report electronic structure and electric field modulation calculations in the width direction for armchair graphene nanoribbons (acGNRs) using a semi-empirical extended Huckel theory. Important band structure parameters are computed, e.g. effectives masses, velocities and bandgaps. For the three types of acGNRs, the pz orbital tight-binding parameters are extracted if feasible. Furthermore, the effect of electric field in the width direction on acGNRs dispersion is explored. It is shown that for the two types of semiconducting acGNRs, an external electric field can reduce the bandgap to a few meV with different quantitative behavior.

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