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arXiv · 1406.6823

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

R. Steinacher·A. A. Kozikov·C. Rössler·C. Reichl·W. Wegscheider·T. Ihn·K. Ensslin
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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.

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R. Steinacher, A. A. Kozikov, C. Rössler, C. Reichl, W. Wegscheider, T. Ihn, K. Ensslin. 2014-06-26. Scanning-gate-induced effects and spatial mapping of a cavity. https://doi.org/10.1088/1367-2630/17/4/043043

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