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Chemically induced topological zero mode at graphene armchair edges

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Title
Chemically induced topological zero mode at graphene armchair edges
Author(s)
Ziatdinov, M; Hyunseob Lim; Fujii, S; Kusakabe, K; Kiguchi, M; Enoki, T; Kim, Y
Publication Date
2017-02
Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.19, no.7, pp.5145 - 5154
Publisher
ROYAL SOC CHEMISTRY
Abstract
The electronic and magnetic properties of chemically modified graphene armchair edges are studied using a combination of tight-binding calculations, first-principles modelling, and low temperature scanning tunneling microscopy (STM) experiments. The atomically resolved STM images of the hydrogen etched graphitic edges suggest the presence of localized states at the Fermi level for certain armchair edges. We demonstrate theoretically that the topological zero-energy edge mode may emerge at armchair boundaries with asymmetrical chemical termination of the two outermost atoms in the unit cell. We particularly focus our attention on armchair edges terminated by various combinations of the hydrogen (H, H-2) and methylene (CH2) groups. The inclusion of the spin component in our calculations reveals the appearance of pi-electron-based magnetism at the armchair edges under consideration ©the Owner Societies 2017
URI
https://pr.ibs.re.kr/handle/8788114/3592
ISSN
1463-9076
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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