Time-dependent current oscillations through a quantum dot

Time-dependent phenomena associated to charge transport along a quantum dot in the charge quantization regime is studied. Superimposed to the Coulomb blockade behavior the current has novel nonlinear properties. Together with static multistabilities in the negative resistance region of the I-V chara cteristic curve, strong correlations at the dot give rise to self-sustained current and charge oscillations. Their properties depend upon the paramete rs of the quantum dot and the external applied voltages.