DYNAMICAL LOCALIZATION AND ABSOLUTE NEGATIVE CONDUCTANCE IN AN AC-DRIVEN DOUBLE-QUANTUM-WELL

We analyze the I-V characteristic of a double quantum well integrated into an antenna and driven by THz radiation. We propose a microscopic model to calculate self-consistently the sequential current including the Coulomb interaction in a mean-field approximation. Additional feat ures in the I-V characteristics appear that depend not only on the fre quency and the intensity of the ac field but also on the charge in the wells. We observe dynamical localization and absolute negative conduc tance in the linear response regime. We compare our calculations with recent experiments in ac-driven double wells.