KONDO EFFECT IN AC TRANSPORT THROUGH QUANTUM DOTS

A theory of the Kondo effect in quantum dots at zero temperature in th e presence of arbitrarily intense ao potentials is presented. We gener alize the Friedel-Langreth sum rule to take care of charge conservatio n and propose a consistent procedure to study a time-dependent Anderso n Hamiltonian. The effect of thr ac potential on both the quantum dot density of states and the linear conductance shows the importance of u sing a theory which describes intradot finite: interaction and nonpert urbative effects. [S0031-9007(98)07727-8].