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 journalArticle

6 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 1

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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