Photon-assisted Stuckelberg-like oscillations in a double quantum dot

The time-dependent charge transfer between quantum dots induced by an ultra short electric field is theoretically analyzed. For double quantum dot coup led to metallic reservoirs we show that the electron-tunneling processes ar e analogous to those occurring in collisions between ions and atoms. As a c onsequence, the total current exhibits Stuckelberg-like oscillations as a f unction of the duration and amplitude of the external field. This effect le ads to a remarkable enhancement of the nonlinear response.