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学術論文

Time-resolved impurity-invisibility in graphene nanoribbons

MPS-Authors
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Tuovinen,  R.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Sentef,  M. A.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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フルテキスト (公開)

c9nr02738f.pdf
(出版社版), 4MB

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Supplementary files.zip
(付録資料), 19MB

引用

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.


引用: https://hdl.handle.net/21.11116/0000-0003-4E5B-1
要旨
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.