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 language | English |
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Pages (from-to) | 1244-1248 |
Number of pages | 5 |
Journal | Current Applied Physics |
Volume | 17 |
Issue number | 10 |
DOIs | |
Publication status | Published - 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