Visualizing atomic-scale negative differential resistance in bilayer graphene.

@article{Kim2013VisualizingAN,
  title={Visualizing atomic-scale negative differential resistance in bilayer graphene.},
  author={Keun Su Kim and Tae-Hwan Kim and Andrew Leigh Walter and Thomas Seyller and Han Woong Yeom and Eli Rotenberg and Aaron Bostwick},
  journal={Physical review letters},
  year={2013},
  volume={110 3},
  pages={036804}
}
We investigate the atomic-scale tunneling characteristics of bilayer graphene on silicon carbide using the scanning tunneling microscopy. The high-resolution tunneling spectroscopy reveals an unexpected negative differential resistance (NDR) at the Dirac energy, which spatially varies within the single unit cell of bilayer graphene. The origin of NDR is explained by two near-gap van Hove singularities emerging in the electronic spectrum of bilayer graphene under a transverse electric field… CONTINUE READING

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