CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
|
|
|
|
Structural and Electronic Properties of Zigzag Graphene Nanoribbons on Si(001) Substrates |
LI Jing, YANG Shen-Yuan**, LI Shu-Shen |
The State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 |
|
Cite this article: |
LI Jing, YANG Shen-Yuan, LI Shu-Shen 2015 Chin. Phys. Lett. 32 027101 |
|
|
Abstract We study the adsorption of zigzag graphene nanoribbons (GNRs) on Si(001) substrates using the first-principles density functional theory, exploring the effects of the interface interaction on the structural and electronic properties of both GNRs and the substrate. By comparing the adsorption structures predicted by the local density approximation, the generalized gradient approximation, and the DFT-D2 approach, we confirm that both edge and inner C atoms of GNRs can form covalent bonds with the substrate. The GNR/substrate interaction destroys the antiferromagnetic coupling of the edge states in GNRs. The charge transfer from the substrate to GNRs exhibits a complicated pattern and is mainly localized near the C–Si bonds. We also observe a strong perturbation of the surface states and a surface reconstruction transition induced by the GNR adsorption.
|
|
Published: 20 January 2015
|
|
PACS: |
71.15.Mb
|
(Density functional theory, local density approximation, gradient and other corrections)
|
|
68.35.-p
|
(Solid surfaces and solid-solid interfaces: structure and energetics)
|
|
73.20.At
|
(Surface states, band structure, electron density of states)
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|