Topological confinement effect of edge potentials in zigzag-edge graphene nanoribbons under a staggered bulk potential
- Authors
- Lee, Kyu Won; Lee, Cheol Eui
- Issue Date
- 10월-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- A. Topological confinement effect; B. Edge potential; C. Gapless edge states; D. Tight binding model
- Citation
- CURRENT APPLIED PHYSICS, v.17, no.10, pp.1244 - 1248
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 17
- Number
- 10
- Start Page
- 1244
- End Page
- 1248
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82079
- DOI
- 10.1016/j.cap.2017.06.008
- ISSN
- 1567-1739
- 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. (C) 2017 Elsevier B.V. All rights reserved.
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Collections - College of Science > Department of Physics > 1. Journal Articles
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