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Discrete charging of traps visualized by scanning gate experiments on a quantum point contact

Pioda, A. ; Kičin, S. ; Brunner, D. ; Ihn, Thomas ; Sigrist, Martin ; Ensslin, Klaus ; Reinwald, Matthias ; Wegscheider, Werner
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Date of publication of this fulltext: 25 Jan 2010 13:45


Abstract

A quantum point contact (QPC) patterned on a two-dimensional electron gas is investigated with a scanning gate setup operated at a temperature of 300 mK. The conductance of the point contact is recorded while the local potential is modified by scanning the tip. Discrete charging of traps induced by the local potential is observed as a stepwise conductance change of the constriction. By ...

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