Giant Quasiparticle Bandgap Modulation in Graphene Nanoribbons Supported on Weakly Interacting Surfaces

Author

• Xueping Jiang, Rensselaer Polytechnic Institute
• Neerav Kharche, Rensselaer Polytechnic Institute
• Paul Kohl, Georgia Institute of Technology - Main Campus
• Timothy B. Boykin, University of Alabama - Huntsville
• Gerhard Klimeck, Network for Computational Nanotechnology, Purdue UniversityFollow
• Mathieu Luisier, Integrated Systems Laboratory, Zurich, Switzerland
• Pulickel M. Ajayan, Rice University
• Saroj K. Nayak, Indian Institute of Technology Bhubaneswar, India

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 selfenergy 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.

Comments

cond-mat.mtrl-sci arXiv:1309.3226

Condensed Matter > Materials Science

Date of this Version

9-12-2013

Recommended Citation

Jiang, Xueping; Kharche, Neerav; Kohl, Paul; Boykin, Timothy B.; Klimeck, Gerhard; Luisier, Mathieu; Ajayan, Pulickel M.; and Nayak, Saroj K., "Giant Quasiparticle Bandgap Modulation in Graphene Nanoribbons Supported on Weakly Interacting Surfaces" (2013). Birck and NCN Publications. Paper 1289.
https://docs.lib.purdue.edu/nanopub/1289