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Issue 25, 2019
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Time-resolved impurity-invisibility in graphene nanoribbons

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Abstract

We investigate time-resolved charge transport through graphene nanoribbons supplemented with adsorbed impurity atoms. Depending on the location of the impurities with respect to the hexagonal carbon lattice, the transport properties of the system may become invisible to the impurity due to the symmetry properties of the binding mechanism. This motivates a chemical sensing device since dopants affecting the underlying sublattice symmetry of the pristine graphene nanoribbon introduce scattering. Using the time-dependent Landauer–Büttiker formalism, we extend the stationary current–voltage picture to the transient regime, where we observe how the impurity invisibility takes place at sub-picosecond time scales further motivating ultrafast sensor technology. We further characterize time-dependent local charge and current profiles within the nanoribbons, and we identify rearrangements of the current pathways through the nanoribbons due to the impurities. We finally study the behavior of the transients with ac driving which provides another way of identifying the lattice-symmetry breaking caused by the impurities.

Graphical abstract: Time-resolved impurity-invisibility in graphene nanoribbons

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Supplementary files

Article information


Submitted
29 Mar 2019
Accepted
07 Jun 2019
First published
10 Jun 2019

This article is Open Access

Nanoscale, 2019,11, 12296-12304
Article type
Paper

Time-resolved impurity-invisibility in graphene nanoribbons

R. Tuovinen, M. A. Sentef, C. Gomes da Rocha and M. S. Ferreira, Nanoscale, 2019, 11, 12296
DOI: 10.1039/C9NR02738F

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