Transport in Two Dimensional Periodic Magnetic Fields

抄録

Ballistic transport properties in a two dimensional electron gas are studiednumerically, where magnetic fields are perpendicular to the plane oftwo dimensional electron systemsand periodically modulated both in x and y directions.We show that there are three types of trajectories of classical electronmotions in this system; chaotic, pinned and runaway trajectories.It is found that the runaway trajectories can explain the peaks ofmagnetoresistance as a function of external magnetic fields, which is believed to be related to the commensurability effect betweenthe classical cyclotron diameter and the period of magnetic modulation.The similarity with and difference from the results in the antidot latticeare discussed.