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Length dependence of the “conductivity” (a), and HOMO–LUMO gap (b), across the zigzag edges of narrow armchair GNRs of width 3× (N = 7), 4× (N = 9), and 5× (N = 11), shown with solid squares, circles, and triangles, respectively. Solid lines correspond to best spline fits along the calculated data points. The electric field is applied along the length direction (joining the zigzag edges) of the AGNRs.
