The influence of impurities on inter-Landau-level equilibration

Strong, reproducible fluctuations are observed in the inter-Landau-level scattering rate as the depletion potential along the edge of a Hall conductor is varied using gate electrodes. The fluctuations are thought to be due to the changing influence of immobile impurity atoms on the scattering rate....

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1991-12, Vol.175 (1), p.235-238
Main Authors: Alphenaar, B.W., McEuen, P.L., Wheeler, R.G., Sacks, R.N.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in interface structures
Exact sciences and technology
Physics
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Summary:Strong, reproducible fluctuations are observed in the inter-Landau-level scattering rate as the depletion potential along the edge of a Hall conductor is varied using gate electrodes. The fluctuations are thought to be due to the changing influence of immobile impurity atoms on the scattering rate. A scattering length is extracted from the data, and its inverse is found to have a linear temperature dependence. This suggests that an activated hopping model, which predicts an exponential temperature dependence, is not applicable.
ISSN:0921-4526
1873-2135
DOI:10.1016/0921-4526(91)90719-U