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
TL;DR
This study employs scanning gate microscopy to visualize and analyze the breakdown of the quantum Hall effect in bilayer graphene, revealing hotspots linked to tip-induced scattering and quantum percolation.
Contribution
It introduces a novel application of scanning gate microscopy to study quantum Hall breakdown in bilayer graphene, providing insights into localized scattering phenomena.
Findings
Identification of hotspots affecting conductance during breakdown
Correlation of hotspots with tip-induced scattering between Landau levels
Modeling of breakdown using quantum percolation theory
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.
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