Abstract
Measurements of commensurability oscillations in GaAs/AlGaAs two-dimensional (2D) hole systems grown on GaAs (3 1 1) A substrates reveal a remarkable anisotropy: the amplitude of the measured commensurability oscillations along the [ 2 ̄ 3 3 ] direction is about 100 times larger than along [0 1 1 ̄ ] . 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 (3 1 1) A interface.
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