Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy

Details Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy

2012-01-19

arxiv.org/abs/1201.4029v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

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.

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