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VOLUME 83 (2006) | ISSUE 7 | PAGE 351
Divergent Coulomb screening in two dimensional electron gas driven by microwaves
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.