منابع مشابه
Energy gaps in graphene nanoribbons.
Based on a first-principles approach, we present scaling rules for the band gaps of graphene nanoribbons (GNRs) as a function of their widths. The GNRs considered have either armchair or zigzag shaped edges on both sides with hydrogen passivation. Both varieties of ribbons are shown to have band gaps. This differs from the results of simple tight-binding calculations or solutions of the Dirac's...
متن کاملEnergy gaps in etched graphene nanoribbons.
Transport measurements on an etched graphene nanoribbon are presented. It is shown that two distinct voltage scales can be experimentally extracted that characterize the parameter region of suppressed conductance at low charge density in the ribbon. One of them is related to the charging energy of localized states, the other to the strength of the disorder potential. The lever arms of gates var...
متن کاملConductance 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...
متن کاملEnergy band-gap engineering of graphene nanoribbons.
We investigate electronic transport in lithographically patterned graphene ribbon structures where the lateral confinement of charge carriers creates an energy gap near the charge neutrality point. Individual graphene layers are contacted with metal electrodes and patterned into ribbons of varying widths and different crystallographic orientations. The temperature dependent conductance measurem...
متن کاملLarge intrinsic energy bandgaps in annealed nanotube-derived graphene nanoribbons.
The usefulness of graphene for electronics has been limited because it does not have an energy bandgap. Although graphene nanoribbons have non-zero bandgaps, lithographic fabrication methods introduce defects that decouple the bandgap from electronic properties, compromising performance. Here we report direct measurements of a large intrinsic energy bandgap of approximately 50 meV in nanoribbon...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2006
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.97.216803