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Proceedings Paper

Effects of accidental microconstriction on the quantizes conductance in long wires
Author(s): A. A. Starikov; I. I. Yakimenko; Karl-Fredrik Berggren; A. C. Graham; K. J. Thomas; Michael Pepper; M. Y. Simmons
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Paper Abstract

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.

Paper Details

Date Published: 11 June 2003
PDF: 4 pages
Proc. SPIE 5023, 10th International Symposium on Nanostructures: Physics and Technology, (11 June 2003); doi: 10.1117/12.513897
Show Author Affiliations
A. A. Starikov, Linkoeping Univ. and Kirensky Institute of Physics (Sweden)
I. I. Yakimenko, Linkoeping Univ. (Sweden)
Karl-Fredrik Berggren, Univ. of Linkoeping (Sweden)
A. C. Graham, Univ. of Cambridge (United Kingdom)
K. J. Thomas, Univ. of Cambridge (United Kingdom)
Michael Pepper, Univ. of Cambridge (United Kingdom)
M. Y. Simmons, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 5023:
10th International Symposium on Nanostructures: Physics and Technology

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