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Graphene nanoribbons (GNRs) are natural waveguides for electrons in graphene.Nevertheless, unlike micron-sized samples, conductance is nearly suppressed inthese narrow graphene stripes, mainly due to scattering with edge disordergenerated during synthesis or cut. A possible way to circumvent this effect isto define an internal waveguide that isolates specific modes from the edgedisorder and allows ballistic conductance. There are several proposals fordefining waveguides in graphene; in this manuscript, we consider strain foldsand scalar potentials and numerically evaluate these proposals' performanceagainst edge and bulk disorder. Using the Green's function approach, wecalculate conductance and the local density of states (LDOS) of zigzag GNRs andcharacterize the performance of these different physical waveguiding effects inboth types of disorder. We found a general improvement in the electronicconductance of GNR due to the presence of the internal waveguiding, with theemergence of plateaus with quasi-ballistic properties and robustness againstedge disorder. These findings are up to be applied in modern nanotechnology andbeing experimentally tested.

Ballistic guided electrons against disorder in graphene nanoribbons