Time-resolved impurity-invisibility in graphene nanoribbons.

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ID: 101808
2019
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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.
Reference Key
tuovinen2019timeresolvednanoscale Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Tuovinen, Riku;Sentef, Michael A;Gomes da Rocha, Claudia;Ferreira, Mauro S;
Journal Nanoscale
Year 2019
DOI
10.1039/c9nr02738f
URL
Keywords
cuprates electron–phonon coupling insulator–metal transition ultrafast optics

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