Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy

M. R. Connolly; R. K. Puddy; D. Logoteta; P. Marconcini; M. Roy; J. Griffths; G. A. C. Jones; P. Maksym; M. Macucci; C. G. Smith

doi:10.1021/nl3015395

Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy

Mesoscale and Nanoscale Physics 2013-03-05 v1

Authors: M. R. Connolly , R. K. Puddy , D. Logoteta , P. Marconcini , M. Roy , J. Griffths , G. A. C. Jones , P. Maksym , M. Macucci , C. G. Smith

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Abstract

We use low-temperature scanning gate microscopy (SGM) to investigate the breakdown of the quantum Hall regime in an exfoliated bilayer graphene flake. SGM images captured during breakdown exhibit intricate patterns of "hotspots" where the conductance is strongly affected by the presence of the tip. Our results are well described by a model based on quantum percolation which relates the points of high responsivity to tip-induced scattering between localized Landau levels.

Keywords

quantum hall effect bilayer graphene scanning gate microscopy breakdown mechanism quantum percolation landau levels hotspots

Cite

@article{arxiv.1201.4029,
  title  = {Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy},
  author = {M. R. Connolly and R. K. Puddy and D. Logoteta and P. Marconcini and M. Roy and J. Griffths and G. A. C. Jones and P. Maksym and M. Macucci and C. G. Smith},
  journal= {arXiv preprint arXiv:1201.4029},
  year   = {2013}
}

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6 pages, 4 figures

Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy

Abstract

Keywords

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