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  Time-resolved impurity-invisibility in graphene nanoribbons

Tuovinen, R., Sentef, M. A., da Rocha, C. G., & Ferreira, M. S. (2019). Time-resolved impurity-invisibility in graphene nanoribbons. Nanoscale, 11, 12296-12304. doi:10.1039/C9NR02738F.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-4E5B-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-F059-A
Genre: Journal Article

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https://arxiv.org/abs/1903.12538 (Preprint)
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https://dx.doi.org/10.1039/C9NR02738F (Publisher version)
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 Creators:
Tuovinen, R.1, Author              
Sentef, M. A.1, Author              
da Rocha, C. G.2, Author
Ferreira, M. S.3, 4, Author
Affiliations:
1Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
2Department of Physics and Astronomy, University of Calgary, ou_persistent22              
3School of Physics, Trinity College Dublin, ou_persistent22              
4Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) andAdvanced Materials and Bioengineering Research (AMBER) Centre, Trinity College Dublin, ou_persistent22              

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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.

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Language(s): eng - English
 Dates: 2019-03-292019-06-072019-06-10
 Publication Status: Published online
 Pages: 9
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 Rev. Method: Peer
 Identifiers: arXiv: 1903.12538
DOI: 10.1039/C9NR02738F
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Project name : R. T. and M. A. S. acknowledge funding by the DFG (Grant No. SE 2558/2-1) through the Emmy Noether program. C. G. R. acknowledges WestGrid (http://www.westgrid.ca) and Compute Canada Calcul Canada (http://www.computecanada.ca) for computational resources.
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Title: Nanoscale
  Abbreviation : Nanoscale
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 11 Sequence Number: - Start / End Page: 12296 - 12304 Identifier: ISSN: 2040-3364
CoNE: https://pure.mpg.de/cone/journals/resource/2040-3364