Giant Quasiparticle Bandgap Modulation in Graphene Nanoribbons Supported on Weakly Interacting Surfaces
Materials Science
2013-09-26 v1
Abstract
In general, there are two major factors affecting bandgaps in nanostructures: (i) the enhanced electron-electron interactions due to confinement and (ii) the modified self-energy of electrons due to the dielectric screening. While recent theoretical studies on graphene nanoribbons (GNRs) report on the first effect, the effect of dielectric screening from the surrounding materials such as substrates has not been thoroughly investigated. Using large-scale electronic structure calculations based on the GW approach, we show that when GNRs are deposited on substrates, bandgaps get strongly suppressed (by as much as 1 eV) even though the GNR-substrate interaction is weak.
Keywords
Cite
@article{arxiv.1309.3226,
title = {Giant Quasiparticle Bandgap Modulation in Graphene Nanoribbons Supported on Weakly Interacting Surfaces},
author = {Xueping Jiang and Neerav Kharche and Paul Kohl and Timothy B. Boykin and Gerhard Klimeck and Mathieu Luisier and Pulickel M. Ajayan and Saroj K. Nayak},
journal= {arXiv preprint arXiv:1309.3226},
year = {2013}
}