Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy

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.

6 pages, 4 figures

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• Symmetry-dependent transport behavior of graphene double dots
• Quantum transport in chemically functionalized graphene at high magnetic field: Defect-Induced Critical States and Breakdown of Electron-Hole Symmetry
• Sinc-based method for an efficient solution in the direct space of quantum wave equations with periodic boundary conditions
• Imaging backscattering in graphene quantum point contacts
• Scanning gate microscopy mapping of edge current and branched electron flow in a transition metal dichalcogenide nanoribbon and quantum point contact
• Probing breakdown of topological protection: Filling-factor-dependent evolution of robust quantum Hall incompressible phases
• Accurate characterization of tip-induced potential using electron interferometry
• Imaging disorder-induced scattering centers in quantum Hall incompressible strip