Scanning-gate-induced effects and spatial mapping of a cavity

Abstract

Tailored electrostatic potentials are the foundation of scanning gate microscopy. We present several aspects of the tip-induced potential on the two-dimensional electron gas. First, we give methods on how to estimate the size of the tip-induced potential. Then, a ballistic cavity is formed and studied as a function of the bias-voltage of the metallic top gates and probed with the tip-induced potential. It is shown how the potential of the cavity changes by tuning the system to a regime where conductance quantization in the constrictions formed by the tip and the top gates occurs. This conductance quantization leads to a unprecedented rich fringe pattern over the entire structure. Finally, the effect of electrostatic screening of the metallic top gates is discussed.

10 pages, 6 figures

References in corpus (11)

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Cited by in corpus (13)

• Electric Field Tunable Topological Phases in Graphene Nanoribbons
• Interference features in scanning gate conductance maps of quantum point contacts with disorder
• Scanning gate experiments: from strongly to weakly invasive probes
• Partial local density of states from scanning gate microscopy
• Scanning gate imaging in confined geometries
• Classical origin of conductance oscillations in an integrable cavity
• Mode specific backscattering in a quantum point contact
• Signatures of folded branches in the scanning gate microscopy of ballistic electronic cavities
• Electron backscattering in a cavity: ballistic and coherent effects
• Accurate characterization of tip-induced potential using electron interferometry
• Imaging signatures of the local density of states in an electronic cavity
• Local signatures of electron-electron scattering in an electronic cavity
• Multitip scanning gate microscopy for ballistic transport studies in systems with two-dimensional electron gas