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.

arXiv comment6 pages, 4 figures

References in corpus (40)

• Control of graphene's properties by reversible hydrogenation
• Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
• Making graphene visible
• Landau Level Splitting in Graphene in High Magnetic Fields
• SiC Graphene Suitable For Quantum Hall Resistance Metrology
• Quantum Resistance Standard Based on Epitaxial Graphene
• Quantum Hall effect and Landau level crossing of Dirac fermions in trilayer graphene
• The microscopic nature of localization in the quantum Hall effect
• Random Network Models and Quantum Phase Transitions in Two Dimensions
• Symmetry breaking of the zero energy Landau level in bilayer graphene
• Ab-initio study of gap opening and screening effects in gated bilayer graphene
• The Quantum Hall Transition in Real Space: From Localized to Extended States
• Evolution of Microscopic Localization in Graphene in a Magnetic Field from Scattering Resonances to Quantum Dots
• Microscopic Polarization in Bilayer Graphene
• Quantized Landau level spectrum and its density dependence
• Models for the integer quantum Hall effect: the network model, the Dirac equation, and a tight-binding Hamiltonian
• On the imaging of electron transport in semiconductor quantum structures by scanning-gate microscopy: successes and limitations
• Order from Disorder in Graphene Quantum Hall Ferromagnet
• A New Liquid Phase and Metal-Insulator Transition in Si MOSFETs
• Quantum resistance metrology in graphene
• The nature of localization in graphene under quantum Hall conditions
• Quantum Hall fluctuations and evidence for charging in the quantum Hall effect
• Imaging Coulomb Islands in a Quantum Hall Interferometer
• Scanning Gate Microscopy on Graphene: Charge Inhomogeneity and Extrinsic Doping
• Mapping the Dirac point in gated bilayer graphene
• Interactions, Localization, and the Integer Quantum Hall Effect
• Scanning gate microscopy of current-annealed single layer graphene
• Local Density of States in Mesoscopic Samples from Scanning Gate Microscopy
• Imaging Transport Resonances in the Quantum Hall Effect
• Imaging coherent transport in graphene (Part II): Probing weak localization
• Imaging Inter-Edge State Scattering Centers in the Quantum Hall Regime
• Tilted potential induced coupling of localized states in a graphene nanoconstriction
• Spatially-resolved analysis of edge-channel equilibration in quantum Hall circuits
• Calculation of the conductance of a graphene sheet using the Chalker-Coddington network model
• Electron correlations and single-particle physics in the Integer Quantum Hall Effect
• Local Current Distribution and "Hot Spots" in the Integer Quantum Hall Regime
• Reading and writing charge on graphene devices
• Hartree-Fock Interactions in the Integer Quantum Hall Effect
• Two-terminal conductance fluctuations in the integer quantum Hall regime
• Quantum Hall conductance of two-terminal graphene devices

Cited by in corpus (14)

• Colloquium: Quantum anomalous Hall effect
• Transport spectroscopy of ultraclean tunable band gaps in bilayer graphene
• Theory of scanning gate microscopy
• Imaging ballistic carrier trajectories in graphene using scanning gate microscopy
• Quantum Hall Effect and Quantum Point Contact in Bilayer-Patched Epitaxial Graphene
• High-performance solution of the transport problem in a graphene armchair structure with a generic potential
• 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