A model for the microwave assisted magnetoresistance oscillations in a 2D electron system

In this work we present a model for the photoconductivity of a two dimensional electron system (2DES) subjected to a magnetic field. The model includes the microwave and Landau contributions in a non-perturbative exact way, Impurity scattering effects are treated perturbatively. Based on this formalism, we provide a Kubo-like formula that takes into account the oscillatory Floquet structure of the problem. We discuss results related with the recently discovered zero-resistance states. It is found that, in agreement with experiment, negative dissipation can only be induced in very high mobility samples. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)