Coherent single-electron transport between coupled quantum dots

摘要

We propose a method for a fully coherent transport of single electrons between the ground states of two anharmonic coupled quantum dots. The transition is achieved as a result of an intrinsic interplay between an external applied radio-frequency field and the interdot tunnel coupling between the single dot states. We have developed a four-level model for the system, and full quantitative agreement with the exact solution of the time-dependent Schroedinger equation is obtained for a wide range of field parameters. The model can be solved analytically for the symmetric case and has the advantage that it can be used as guidance in the actual design of such systems.