Imaging backscattering through impurity-induced antidots in quantum Hall constrictions
arXiv:1209.2438 · doi:10.1103/PhysRevB.86.085326
Abstract
We exploit the biased tip of a scanning gate microscope (SGM) to induce a controlled backscattering between counter-propagating edge channels in a wide constriction in the quantum Hall regime. We compare our detailed conductance maps with a numerical percolation model and demonstrate that conductance fluctuations observed in these devices as a function of the gate voltage originate from backscattering events mediated by localized states pinned by potential fluctuations. Our imaging technique allows us to identify the necessary conditions for the activation of these backscattering processes and also to reconstruct the constriction confinement potential profile and the underlying disorder.
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- Manipulating quantum Hall edge channels in graphene through Scanning Gate Microscopy
- Dynamics and Hall-edge-state mixing of localized electrons in a two-channel Mach-Zehnder interferometer
- Anomalous periodicity and parafermion hybridization in superconducting qubits
- Scanning Gate Imaging of quantum point contacts and the origin of the 0.7 Anomaly
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