Current-induced runaway vibrations in dehydrogenated graphene nanoribbons

Rasmus Bjerregaard Christensen, Jing Tao Lu, Per Hedegard, Mads Brandbyge

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Abstract

We employ a semi-classical Langevin approach to study current-induced atomic dynamics in a partially dehydrogenated armchair graphene nanoribbon. All parameters are obtained from density functional theory. The dehydrogenated carbon dimers behave as effective impurities, whose motion decouples from the rest of carbon atoms. The electrical current can couple the dimer motion in a coherent fashion. The coupling, which is mediated by nonconservative and pseudo-magnetic current-induced forces, change the atomic dynamics, and thereby show their signature in this simple system. We study the atomic dynamics and current-induced vibrational instabilities using a simplified eigen-mode analysis. Our study illustrates how armchair nanoribbons can serve as a possible testbed for probing the current-induced forces.
Original languageEnglish
JournalBeilstein Journal of Nanotechnology
Volume7
Pages (from-to)68-74
Number of pages7
ISSN2190-4286
DOIs
Publication statusPublished - 2016

Bibliographical note

This is an Open Access article under the terms of the Creative Commons Attribution License

Keywords

  • Current-induced forces
  • Density functional theory (NEGF-DFT)
  • Graphene
  • Molecular electronics

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