Magnetotransport in large diameter InAs/GaSb antidot lattices

We investigated the magnetotransport through high mobility InAs/GaSb antido t lattices with large antidot diameter at different temperatures and varyin g electron concentrations. In addition to pronounced low-field peaks alread y known from GaAs antidot lattices, we find an additional broad maximum at fields slightly above 2 T, which is associated with rosetta orbits surround ing one antidot. The results of a numerical analysis based on the classical Kubo formula using a hard-wall potential are in good agreement with experi ment. At low temperatures we observe weak, nearly 1/B-periodic oscillations superimposed on this maximum, which may be due to quantized rosetta orbits . (C) 1998 Elsevier Science B.V. All rights reserved.