Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-02-04
Phys. Rev. B 81, 085427 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, accepted for publication at PRB
Scientific paper
10.1103/PhysRevB.81.085427
We present a systematic study of electron backscattering phenomena during conduction for graphene nanoribbons with single-vacancy scatterers and dimensions within the capabilities of modern lithographic techniques. Our analysis builds upon an \textit{ab initio} parameterized semiempirical model that breaks electron-hole symmetry and nonequilibrium Green's function methods for the calculation of the conductance distribution $g$. The underlying mechanism is based on wavefunction localizations and perturbations that in the case of the first $\pi-\pi{}^*$ plateau can give rise to impurity-like pseudogaps with both donor and acceptor characteristics. Confinement and geometry are crucial for the manifestation of such effects. Self-consistent quantum transport calculations characterize vacancies as local charging centers that can induce electrostatic inhomogeneities on the ribbon topology.
Deretzis Ioannis
Fiori Gianluca
Iannaccone Giovanni
Magna Antonino La
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