2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/128469Graphene nanoribbons are quasi-one-dimensional meterials with finite width. Characterizing a wide class of nanoribbons by edge shape and width, we make a systematic analysis of their electronic properties. The band gap structure of nanoribbons is shown to exhibit a valley structure with stream-like sequences of metallic or almost metallic nanoribbons. Among them, all zigzag nanoribbons are metallic, and armchair nanoribbons are metallic by period of 3. We find that these stream-like sequences correspond to equi-width curves, and that the band gap of chiral and armchair nanoribbons oscillate as a function of the width. Furthermore a possible application of nanoribbons to nanoelectronics is discussed.8 pages, 7 figures: Presented at 14th International Conference on Superlattices, Nano-Structures and Nano-Devices, Istanbul, July 30-August 4 (2006); Cover picture of the proceedingMesoscale and Nanoscale PhysicsMaterials Sciencetext