un 2 00 2 Effects of accidental microconstriction on the quantized conductance in long wires
نویسندگان
چکیده
We have investigated the conductance of long quantum wires formed in GaAs/AlxGa1−xAs heterostructures. Using realistic fluctuation potentials from donor layers we have simulated numerically the conductance of four different kinds of wires. While ideal wires show perfect quantization, potential fluctuations from random donors may give rise to strong conductance oscillations and degradation of the quantization plateaux. Statistically there is always the possibility of having large fluctuations in a sample that may effectively act as a microconstriction. We therefore introduce microcon-strictions in the wires by occasional clustering of donors. These microconstrictions are found to restore the quantized plateaux. A similar effect is found for accidental litho-graphic inaccuracies.
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