Peculiar Band Gap Structure of Graphene Nanoribbons

Details Peculiar Band Gap Structure of Graphene Nanoribbons Peculiar Band Gap Structure of Graphene Nanoribbons

2007-05-06

arxiv.org/abs/0705.0786v1

Physica Status Solidi (c) 4, No.2, 489 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures: Presented at 14th International Conference on Superlattices, Nano-Structures and Nano-Devices, Istanbul, J

Scientific paper

10.1002/pssc.200790003 10.1002/p

Graphene 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.

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