Band warping effect appeared in commensurability oscillations in antidot lattices of a two‐dimensional hole gas

We have confirmed band warping effect of twodimensional holes confined at GaAs/AlGaAs singleheterojunction through classical commensurability resistance oscillations in anti-dot lattices (ADLs). The oscillations in the triangular ADLs are decomposed into three peaks, two of which are assigned to localized orbits of holes with a lighter effective math (l-hole), and the other is assigned to that of holes with heavier average effective math (h-hole). The latter assignment is possible only when the h-hole band is heavily warped, thus evidencing the warping. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)