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VOLUME 83 | ISSUE 7 | PAGE 351
Divergent Coulomb screening in two dimensional electron gas driven by microwaves
A. Kashuba
L.D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia

PACS: 73.21.-b, 73.40.-c, 78.67.-n
Abstract
Two dimensional electron gas in perpendicular magnetic field, driven by microwave ac- field is studied. The magneto-conductivity and the diffusion constant are calculated in the microscopic model. In the driven state the Einstein relation is violated. Instability of the Coulomb screening and a divergence of the effective donor electrostatic field due to the negative Ryzhii currents is predicted. This phenomenon results in the zero-resistance states observed experimentally.


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