"Transport in two-dimensional magnetic systems"
We review several models of two dimensional systems exposed
to a magnetic field perpendicular to the plane with the emphasis on the
transport caused by various erturbations. One concerns a parabolic potential
channel; we discuss how is the ac spectrum modified by periodic and "random"
perturbations. In other models we have just singular perturbation
supported by an array of points or by a curve. In particular, we show the
existence of persistent currents if the latter is a loop and the perturbation
is trong enough.
Last updated: 28.08.2002