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11 June 2003 Effects of accidental microconstriction on the quantized conductance in long wires
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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 microconstrictions in the wires by occasional clustering of donors. These microconstrictions are found to restore the quantized plateaux. A similar effect is found for accidental lithographic inaccuracies.
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A. A. Starikov, I. I. Yakimenko, Karl-Fredrik Berggren, A. C. Graham, K. J. Thomas, Michael Pepper, and M. Y. Simmons "Effects of accidental microconstriction on the quantized conductance in long wires", Proc. SPIE 5023, 10th International Symposium on Nanostructures: Physics and Technology, (11 June 2003);

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