Magnetotransport in Antidot Arrays

Abstract

We study magnetotransport in lateral two- dimensional superlattices with periods on the order of 100 nm. Pronounced low-field transport anomalies reflect the interplay of two characteristic lengths of the system, the cyclotron radius and the period . Measurements at very low temperatures reveal quantum oscillations, periodic in the magnetic field , which are superimposed upon the commensurability anomalies in the magnetoresistance . We show that the latter effect can be interpreted in terms of quantized periodic orbits which takes into account the chaotic nature of the classical phase space.