Transport Through a Driven Three-Site System

In recent years several suggestions how to set up a single electron transistor have been made [1,2,3,4]. The development of new methods to contact molecules or molecule-like systems and control the electron transport through them [5,6,7] is a major issue in the promising field of molecular electronics [8,9]. The conventional setup of such a transistor requires a gate in order to trigger via the gate voltage the current from the source to the drain which correspond to the lead contacts of the molecular system. In fact, the implementation of a single gate electrode which creates a sufficiently strong field at the molecule is a