Fabrication of quantum point contacts by engraving GaAs/AlGaAs-heterostructures with a diamond tip

Details Fabrication of quantum point contacts by engraving GaAs/AlGaAs-heterostructures with a diamond tip Fabrication of quantum point contacts by engraving GaAs/AlGaAs-heterostructures with a diamond tip

2002-02-22

arxiv.org/abs/cond-mat/0202402v2

Applied Physics Letters 81(11), 2023-2025 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures

Scientific paper

10.1063/1.1506417

We use the all-diamond tip of an atomic force microscope for the direct engraving of high quality quantum point contacts in GaAs/AlGaAs-heterostructures. The processing time is shortened by two orders of magnitude compared to standard silicon tips. Together with a reduction of the line width to below 90 nm the depletion length of insulating lines is reduced by a factor of two with the diamond probes. The such fabricated defect free ballistic constrictions show well resolved conductance plateaus and the 0.7 anomaly in electronic transport measurements.

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