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Effects of accidental microconstriction on the quantized conductance in long wires
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
Cavendish Laboratory, Madingley Road, Cambridge CB3 00HE, United Kingdom.
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2003 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 5023, 267-270 p.Conference paper, Published paper (Other academic)
Abstract [en]

We have investigated the conductance of long quantum wires formed in GaAs/ AlxGa1-x As 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.

Place, publisher, year, edition, pages
2003. Vol. 5023, 267-270 p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-46484DOI: 10.1117/12.513897OAI: oai:DiVA.org:liu-46484DiVA: diva2:267380
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Starikov, AntonBerggren, Karl-Fredrik

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The Institute of TechnologyDepartment of Physics, Chemistry and BiologyTheoretical Physics
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