CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
|
|
|
|
N-Doped Zigzag Graphene Nanoribbons on Si(001): a First-Principles Calculation |
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 077102 |
|
|
Abstract The structural and electronic properties of N-doped zigzag graphene nanoribbons (N-ZGNRs) adsorbed on Si(001) substrates are investigated with first-principles density functional calculations. Compared with the free-standing N-ZGNRs, the energy difference between the substitutional doping at the edge and the inner sites is significantly decreased on the Si substrate. The distribution of the extra charge induced by the N substitutional dopant keeps the Friedel oscillation feature, and is a main effect that influences the C–Si bonding strength. When N is doped in regions with high C–Si bond densities, the strain induced by the dopant also plays an important role in determining the C–Si bonding interactions. Similar to the undoped case, the strong N-ZGNR/Si interaction destroys the antiferromagnetic coupling of the edge states in N-ZGNR, leading to a non-magnetic ground state for the N-ZGNR/Si heterostructures.
|
|
Received: 03 April 2015
Published: 30 July 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
|
|
|
|
|