Volume 61, Number 5, March 2003
|Page(s)||674 - 680|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 February 2003|
Transport signatures of correlated disorder in a two-dimensional electron gas
Solid State Physics Laboratory, ETH Zürich - 8093 Zürich, Switzerland
2 Department of Physics and Astronomy, Ohio University Athens, OH 45701-2979, USA
3 Materials Department, University of California - Santa Barbara, CA 93106, USA
Accepted: 19 December 2002
We report electronic transport measurements on two-dimensional electron gases in a heterostructure with an embedded layer of self-assembled quantum dots. At high dot densities, pronounced Altshuler-Aronov-Spivak magnetoresistance oscillations are observed, which indicate short-range ordering of the potential landscape formed by the charged dots and the strain fields. The presence of these oscillations coincides with the observation of a metal-insulator transition, and a maximum in the electron mobility as a function of the electron density. Within a model based on correlated disorder, we establish a relation between these effects.
PACS: 73.40.-c – Electronic transport in interface structures / 73.21.La – Quantum dots / 72.15.Rn – Localization effects (Anderson or weak localization)
© EDP Sciences, 2003
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