No abstract

No abstract

A lateral antidot array with a lattice period of 400 nm fabricated with electron-beam lithography on GaAs/Al Ga& As heterostructures was investigated by microwave photoconductivity. Commensurability effects and distinct deviations from the classical cyclotron resonance have been observed in agreement with model calculations based on nonlinear dynamics of the electrons.

WC study magnetotransport in lateral two-dimensional superlattices with periods on the order of IO0 nm. Pronounced low-field transport anomalies reflect the interplay of two characteristic lengths of the system. the cyclotron radius R, and the period a. Measurements at very low ternpcraturcs revcal quantum oscillations. periodic in the magnetic field B, which are supcrimposcd upon the commensurability anomalies in the magnctorcsistancc I_', ). We show that the latter effect can lx interpreted in terms of quantized pet%lic orbits which takes inlo account the chaotic nature of the classical phase space

No abstract