University of Minnesota

Title: Kondo effect in a quantum dot out of equilibrium

Abstract: The Kondo effect in a quantum dot driven out of equilibrium by an external ac field is studied. We demonstrate that the ac field brings decoherence in the spin states of the dot. This effect cuts off the Kondo anomaly in dc conductance even at zero temperature. We evaluate the dependence of the dc conductance in the Kondo regime on the power of ac field, this dependence being determined by the decoherence.