Conductance quantization and transport gaps in disordered graphene nanoribbons

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Conductance quantization and transport gaps in disordered graphene nanoribbons

E. R. Mucciolo,1 A. H. Castro Neto,2 and C. H. Lewenkopf3,4 Department of Physics, University of Central Florida, P.O. Box 162385, Orlando, Florida 32816, USA Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA Departamento de Fı́sica Teórica, Universidade do Estado do Rio de Janeiro, 20550-900 Rio de Janeiro, Brazil Laboratório Nacional de Luz Sı́n...

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Conductance quantization in graphene nanoribbons: Adiabatic approximation

A theory of electron states for graphene nanoribbons with a smoothly varying width is developed. It is demonstrated that the standard adiabatic approximation allowing to neglect the mixing of different standing waves is more restrictive for the massless Dirac fermions in graphene than for the conventional electron gas. In general, one can expect a well-pronounced conductance quantization only f...

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Electron transport in disordered graphene nanoribbons.

We report an electron transport study of lithographically fabricated graphene nanoribbons (GNRs) of various widths and lengths. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the GNR width. In this gap, electrons are localized, and charge transport exhibits a transition between thermally activated behavior at higher temperatures ...

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Dirac point resonances due to atoms and molecules adsorbed on graphene and transport gaps and conductance quantization in graphene nanoribbons with covalently bonded adsorbates

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Energy gaps in graphene nanoribbons.

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ژورنال

عنوان ژورنال: Physical Review B

سال: 2009

ISSN: 1098-0121,1550-235X

DOI: 10.1103/physrevb.79.075407