Dynamic behavior of asymmetric quantum dot cells

We study the dynamic evolution of 4- and 5-quantum dot cells in the presence of a time-dependent driver cell. We analyze the effects of imperfections, tunneling intensity and switching times on the response of the basic cell, for linear and periodic switching of the driver polarization. We find that the effects of the imperfections have strong consequences in slowing down the response of the basic cell and that the five-dot cell is less sensitive to these effects. Further studies show that a rapid deterioration of the response takes place as more cells are included. Effects of a time-dependent variation of the tunneling parameter as the switching takes place are also analyzed.