Abstract
We study the yield and reproducibility of quantized conductance in short one-dimensional quantum wires in split-gate transistors. In order to get an unambiguous assessment, more than 500 split gates have been fabricated and tested at 1.4 K. The study clearly shows that the devices are too sensitive to the inherent dopant structures and to variations of processing. The limitations of split gates also have been revealed through the fluctuations of the pinch-off voltage and the characteristics of the first quantized plateau.
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