Dynamical evolution of electronic states in quantum devices

A new approach to transformation and processing of information is proposed which is based on the controllable electron wave function rearrangement in quantum devices. The basic idea is mostly developed for the quantum analogue of CMOS structure. Introduction of the additional controlling contact and input gates makes it possible to realize a complete set of logic operations. Impurity energy modulation in multiple quantum wells is proposed as a basic idea for novel quantum devices. We investigate the evolution of electronic states of such systems to a time-dependent electric field. It was established that the dynamic evolution problem for a two-level system corresponds exactly to a static scattering problem and demonstrate that it is possible for dynamic analogues of reflectionless potential to exist. In order to describe how the wave function evolves in such systems subjected to a periodically time-varying strong external field, we have developed a temporal analogue of the Kronig-Penney model, which we use here to compute the dependence of the quasi-energy and Floquet functions on the amplitude and period of the external field