In pristine graphene ribbons, disruption of the aromatic bond network results in depopulation of covalent orbitals and tends to elongate the edge, with an effective force of f e ~ 2 eV/Å (larger for armchair edges than for zigzag edges, according to calculations). This force can have quite striking macroscopic manifestations in the case of narrow ribbons, as it favors their spontaneous twisting...

Quantum-mechanical calculations of electron magnetotransport in ideal graphene nanoribbons are presented. In noninteracting theory, it is predicted that an ribbon attached to wide leads should reveal Fabry-P\'erot conductance oscillations magnetic field. the theory with Coulomb interaction taken into account, oscillation pattern rather be determined by Aharonov-Bohm interference effect. Both th...

We revisit the problem of electron transport in clean and disordered zigzag graphene nanoribbons, and expose numerous hitherto unknown peculiar properties of these systems at zero energy, where both sublattices decouple because of chiral symmetry. For clean ribbons, we give a quantitative description of the unusual power-law dispersion of the central energy bands and of its main consequences, i...

We analyze nonlinear optics schemes for generating pairs of quantum entangled plasmons in the terahertz-infrared range graphene. predict that high plasmonic field concentration and strong optical nonlinearity monolayer graphene enables pair-generation rates much higher than those conventional photonic sources. The first scheme we study is spontaneous parametric down conversion a nanoribbon. In ...

Density functional theory calculations have been used to analyze the electronic and magnetic properties of ultrathin zigzag graphene nanoribbons (ZGNRs) with different edge saturations. We have compared a symmetric hydrogen saturation of both edges with an asymmetric saturation in which one of the edges is saturated with sulphur atoms or thiol groups, while the other one is kept hydrogen satura...

Developments in semiconductor technology are propelling the dimensions of devices down to 10 nm, but facing great challenges in manufacture at the sub-10 nm scale. Nanotechnology can fabricate nanoribbons from two-dimensional atomic crystals, such as graphene, with widths below the 10 nm threshold, but their geometries and properties have been hard to control at this scale. Here we find that ro...

Efforts to modulate the electronic properties of atomically thin crystalline nanoribbons requires precise control over their morphology. Here, we perform atomistic simulations on freestanding graphene nanoribbons (GNRs) to first identify the minimal shapes as a function of ribbon width, and then develop a core-edge framework based on classical plate theory to explore the effect of size and ribb...