Magnetotransport in two-dimensional lateral superlattices

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Abstract
Two-dimensional electron systems on GaAs heterostructures subjected to a two-dimensional superlattice potential reveal novel features in the magnetoresistance. Strong density modulation causing the formation of antidots is accompanied by a pronounced magnetoresistance maximum. On weakly modulated systems, oscillations are observed that reflect the commensurability of the cyclotron diameter and the superlattice period. A classical model of ballistic motion resulting in magnetic-field-dependent diffusion is found to explain our and other recent magnetotransport observations.