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