title: Anisotropic disorder in high-mobility 2D heterostructures and its correlation to electron transport.
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.
authors.affiliation: Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Willett
authors.forename: J W
authors.initials: JW
authors.lastname: Hsu
authors.forename: D
authors.initials: D
authors.lastname: Natelson
authors.forename: K W
authors.initials: KW
authors.lastname: West
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer