Quasiclassical negative magnetoresistance of atwo-dimensional electron gas in a spatially random magneticfield

摘要

We have studied negative magnetoresistance of a non-planar two-dimensionalelectron gas. Effectively due to the curved AlGaAs/GaAs interface electrons see a uniformin-plane magnetic field B as a random magnetic field (RMF). Small additional perpendicularB leads to a negative magnetoresistance predicted by a semiclassical treatment of the RMFproblem beyond the relaxation time approximation, in accordance with our observations.