منابع مشابه
Crossover from Coulomb blockade to quantum Hall effect in suspended graphene nanoribbons.
Suspended graphene nanoribbons formed during current annealing of suspended graphene flakes have been investigated experimentally. Transport measurements show the opening of a transport gap around charge neutrality due to the formation of "Coulomb islands", coexisting with quantum Hall conductance plateaus appearing at moderate values of the magnetic field B. Upon increasing B, the transport ga...
متن کاملCoulomb blockade effect of molecularly suspended graphene nanoribbons investigated with scanning tunneling microscopy
Z. F. Zhong,1 H. L. Shen,2 R. X. Cao,1 L. Sun,1 K. P. Li,1 J. Hu,1 Z. Liu,1 D. Wu,1 X. R. Wang,2,* and H. F. Ding1,† 1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 22 Hankou Road, Nanjing 210093, People’s Republic of China 2National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering, Nanjing University, ...
متن کاملKohn anomalies in graphene nanoribbons
The quantum corrections to the energies of the point optical phonon modes Kohn anomalies in graphene nanoribbons NRs are investigated. We show theoretically that the longitudinal optical LO modes undergo a Kohn anomaly effect, while the transverse optical TO modes do not. In relation to Raman spectroscopy, we show that the longitudinal optical modes are not Raman active near the zigzag edge, wh...
متن کاملInterfaces Within Graphene Nanoribbons
We study the conductance through two types of graphene nanostructures: nanoribbon junctions in which the width changes from wide to narrow, and curved nanoribbons. In the wide-narrow structures, substantial reflection occurs from the wide-narrow interface, in contrast to the behavior of the much studied electron gas waveguides. In the curved nanoribbons, the conductance is very sensitive to det...
متن کاملEnergy 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...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2007
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.99.166803