Quasiclassical negative magnetoresistance of a 2D electron gas:: Interplay of strong scatterers and smooth disorder -: art. no. 126805

We study the quasiclassical magnetotransport of noninteracting fermions in two dimensions moving in a random array of strong scatterers (antidots, impurities, or defects) on the background of a smooth random potential. We demonstrate that the combination of the two types of disorder induces a novel-mechanism leading to a strong negative magnetoresistance, followed by the saturation of the magnetoresistivity rho (xx)(B) at a value detennined solely by the smooth disorder. Experimental relevance to the transport in semiconductor heterostructures is discussed.