Anisotropic transport of two-dimensional holes in high Landau levels

Qualitatively similar anomalies in a high-mobility GaAs/AlGaAs 2D hole system (2DHS) are presented. Magnetoresistance data taken along [233] and [011] directions in a GaAs/AlGaAs 2D hole sample with van der Pauw geometry exhibit significant anisotropy at half-integer filling factors. The anisotropy depend on both the density and symmetry of the hole charge distribution.