Manipulation of tunnelling in a quantum dot array
Zhe Jiang, Duan Suqing, Xian-Geng Zhao · Journal of Physics Condensed Matter · 2005
In this paper we present a method to control the electronic position in a quantum dot array coherently with a two-electron model. In this novel phenomenon, we find that the external ac driving field has a good manipulative effect on the tunnelling, and therefore the penetrability of the barrier can be easily adjusted. Through studying the Floquet spectrum of the system, we find that it can be divided into two minibands. The upper miniband describes the physical process of states in which the two electrons stay in the same dot and the lower miniband describes the states in which the two electrons stay in different dots. The parameter regions in which the manipulation of tunnelling is investigated exactly correspond to the collapse zones of quasi-energy levels.