Fast single-electron transport in a double quantum dot

摘要

We analyze two realistic experimental setups for quantum-controlled single-electron transport between coupled two-dimensional parabolic quantum dots. The dynamics is induced by two time-dependent electromagnetic switches: (ⅰ) a linear electric switch and (ⅱ) an intense alternating microwave field. From solving the time-dependent Schrodinger equation it is shown that these switches can move an initially localized wave function from one of the dot centers to the other with unit probability. In the case of (ⅰ) the transition is direct, while in the case (ⅱ) the quasiclassical transition dynamics involves a large number of eigenstates coupled by multiphoton emissions and absorptions.