Strain fold-like deformations on armchair graphene nanoribbons (AGNRs) can beproperly engineered in experimental setups, and could lead to a new controllingtool for gaps and transport properties. Here, we analyze the electronicproperties of folded AGNRs relating the electronic responses and the mechanicaldeformation. An important and universal parameter for the gap engineering isthe ribbon percent width variation, i.e., the difference between the deformedand undeformed ribbon widths. AGNRs bandgap can be tuned mechanically in a welldefined bounded range of energy values, eventually leading to a metallicsystem. This characteristic provides a new controllable degree of freedom thatallows manipulation of electronic currents. We show that the numerical resultsare analytically predicted by solving the Dirac equation for the strainedsystem.
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