title: Quasiclassical negative magnetoresistance of a 2D electron gas: interplay of strong scatterers and smooth disorder.
abstract: 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 determined solely by the smooth disorder. Experimental relevance to the transport in semiconductor heterostructures is discussed.
authors.affiliation: Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany.
authors.forename: A D
authors.initials: AD
authors.lastname: Mirlin
authors.forename: D G
authors.initials: DG
authors.lastname: Polyakov
authors.forename: F
authors.initials: F
authors.lastname: Evers
authors.forename: P
authors.initials: P
authors.lastname: Wölfle