Theory of the valley-valve effect in graphene nanoribbons

@article{Akhmerov2008TheoryOT,
  title={Theory of the valley-valve effect in graphene nanoribbons},
  author={A. Akhmerov and J. Bardarson and A. Rycerz and C. Beenakker},
  journal={Physical Review B},
  year={2008},
  volume={77},
  pages={205416}
}
  • A. Akhmerov, J. Bardarson, +1 author C. Beenakker
  • Published 2008
  • Physics
  • Physical Review B
  • A potential step in a graphene nanoribbon with zigzag edges is shown to be an intrinsic source of intervalley scattering -- no matter how smooth the step is on the scale of the lattice constant a. The valleys are coupled by a pair of localized states at the opposite edges, which act as an attractor/repellor for edge states propagating in valley K/K'. The relative displacement Delta along the ribbon of the localized states determines the conductance G. Our result G=(e^{2}/h)[1-\cos(N\pi+2\pi… CONTINUE READING
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