ELECTRON TRAJECTORIES IN RECTANGULAR ANTIDOT SUPERLATTICES

A periodic array of potential pillars is superimposed on a two-dimensi onal electron gas being ballistic on the length scale of the lattice p eriod. Pronounced maxima occur in the magnetoresistance of such system s. The magnetoconductivity as obtained from the magnetoresistance via a tensor inversion displays maxima or minima depending on the directio n of current flow with respect to the lattice orientation, So-called p inned electron orbits as well as runaway trajectories coexist and spec ifically influence a given element of the conductivity tenser. In cont rast to square lattices, both sets of trajectories show up in the expe rimental data simultaneously.