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

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arxiv 1406.6823 v2 pith:JJR2EJSA submitted 2014-06-26 cond-mat.mes-hall

R. Steinacher , A.A. Kozikov , C. Rössler , C. Reichl , W. Wegscheider , T. Ihn , K. Ensslin This is my paper · ORCID
classification cond-mat.mes-hall
keywords potentialcavitygatestip-inducedconductanceelectrostaticformedmetallic
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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.

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