Knauf, AndreasSchulz, FrankSiburg, Karl Friedrich2012-08-072012-08-072012-08-07http://hdl.handle.net/2003/2957510.17877/DE290R-4869We study the dynamics of a charged particle in a planar magnetic field which consists of n >= 1 disjoint localized peaks. We show that, under mild geometric conditions, this system is semi-conjugated to the full shift on n symbols and, hence, carries positive topological entropy.en610preprint