Highly anisotropic commensurability oscillations in two-dimensional holes at the GaAs/AlGaAs (311)A interface
Jeng-Bang Yau, Jeng-Ping Lu, Harindran C. Manoharan, Mansour Shayegan
Abstract
Measurements of commensurability oscillations in GaAs/AlGaAs two-dimensional (2D) hole systems grown on GaAs (311)A substrates reveal a remarkable anisotropy: the amplitude of the measured commensurability oscillations along the [233] direction is about 100 times larger than along [011]. For 2D electron systems at similar interfaces, however, we observe nearly isotropic oscillations, suggesting that the anomalous anisotropy is intrinsic to GaAs 2D holes at the (311)A interface.
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