Quasiclassical negative magnetoresistance of a 2D electron gas: interplay of strong scatterers and smooth disorder

Details Quasiclassical negative magnetoresistance of a 2D electron gas: interplay of strong scatterers and smooth disorder Quasiclassical negative magnetoresistance of a 2D electron gas: interplay of strong scatterers and smooth disorder

2001-04-05

arxiv.org/abs/cond-mat/0104096v1

Phys. Rev. Lett. 87, 126805 (2001).

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.87.126805

We study the quasiclassical magnetotransport of non-interacting 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.

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