Anisotropic disorder in high-mobility 2D heterostructures and its correlation to electron transport |
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Authors: | Willett R L Hsu J W Natelson D West K W Pfeiffer L N |
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Affiliation: | Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA. |
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Abstract: | Surface morphology of high-mobility heterostructures is examined and correlated with dc transport. All samples examined show evidence of lines in the [11-0] direction with roughness ranging from small-amplitude features to severe anisotropic ridges. Transport in these samples is consistent with that in samples having artificially induced 1D charge modulations. The native surface properties reflect a prevalent, anisotropic disorder affecting 2D electron conduction. Importantly, the native lines are orthogonal to the stripes theoretically proposed to explain high Landau level transport anisotropies. |
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