TY - JOUR
T1 - Topological confinement effect of edge potentials in zigzag-edge graphene nanoribbons under a staggered bulk potential
AU - Lee, Kyu Won
AU - Lee, Cheol Eui
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (Project No. 2016R1D1A1A09917003, No. 2016R1D1A1B03931144, No. 2015M1A7A1A01002234, and No. NRF-2010-0027963). K.W.L. gratefully acknowledges a Korea University research grant.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/10
Y1 - 2017/10
N2 - 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.
AB - 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.
KW - A. Topological confinement effect
KW - B. Edge potential
KW - C. Gapless edge states
KW - D. Tight binding model
UR - http://www.scopus.com/inward/record.url?scp=85021066116&partnerID=8YFLogxK
U2 - 10.1016/j.cap.2017.06.008
DO - 10.1016/j.cap.2017.06.008
M3 - Article
AN - SCOPUS:85021066116
SN - 1567-1739
VL - 17
SP - 1244
EP - 1248
JO - Current Applied Physics
JF - Current Applied Physics
IS - 10
ER -