Topological confinement effect of edge potentials in zigzag-edge graphene nanoribbons under a staggered bulk potential

Kyu Won Lee, Cheol Eui Lee

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    We have investigated topological confinement effects of edge potentials on gapless edge states in zigzag-edge graphene nanoribbons (ZGNRs) under a staggered bulk potential. A variety of gapless edge states were predicted with the concept of topological confinement effect alone, which was confirmed by using tight-binding model calculations. Half-metallicity of ZGNR, which has been semiclassically described, was revealed to fundamentally result from a topological confinement effect. Edge potentials were found to allow an infinitesimal staggered bulk potential to result in gapless edge states, regardless of the ribbon width. A uniform or staggered potential applied to the boundary region narrower than a critical width was found to play a role of the edge potentials, and the critical width was estimated.

    Original languageEnglish
    Pages (from-to)1244-1248
    Number of pages5
    JournalCurrent Applied Physics
    Volume17
    Issue number10
    DOIs
    Publication statusPublished - 2017 Oct

    Bibliographical note

    Publisher Copyright:
    © 2017 Elsevier B.V.

    Keywords

    • A. Topological confinement effect
    • B. Edge potential
    • C. Gapless edge states
    • D. Tight binding model

    ASJC Scopus subject areas

    • General Materials Science
    • General Physics and Astronomy

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