Effects of accidental microconstriction on the quantizes conductance in long wires

A. A. Starikov; I. I. Yakimenko; Karl-Fredrik Berggren; A. C. Graham; K. J. Thomas; Michael Pepper; M. Y. Simmons

doi:10.1117/12.513897

11 June 2003 Effects of accidental microconstriction on the quantized conductance in long wires

A. A. Starikov, I. I. Yakimenko, Karl-Fredrik Berggren, A. C. Graham, K. J. Thomas, Michael Pepper, M. Y. Simmons

Proceedings Volume 5023, 10th International Symposium on Nanostructures: Physics and Technology; (2003) https://doi.org/10.1117/12.513897
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

We have investigated the conductance of long quantum wires formed in GaAs/Al_xGa_1-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.

Citation Download Citation

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); https://doi.org/10.1117/12.513897

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