Kondo time scales for quantum dots: Response to pulsed bias potentials

The response of a quantum dot in the Kondo regime to rectangular pulsed bia s potentials of various strengths and durations is studied theoretically. I t is found that the rise time is faster than the fall time, and also faster than time scales normally associated with the Kondo problem. For larger va lues of the pulsed bias, one can induce dramatic oscillations in the induce d current with a frequency approximating the splitting between the Kondo pe aks that would be present in steady state. The effect persists in the total charge transported per pulse, which should facilitate the experimental obs ervation of the phenomenon.