%0 Journal Article
%T Dynamic Behavior of Excitons in Coupled Double Quantum Dots Driven by DC-AC Electric Fields<br>DC-AC驱动下耦合双量子点分子中激子的动力学行为
%A Su Xiyu
%A Quan Xiumei
%A Guo Dejun
%A <br>苏希玉
%A 全秀梅
%A 郭德军
%J 半导体学报
%D 2007
%I 
%X With a two-site Hubbard model and the Floquet theory,the dynamic behavior of excitons in coupled double quantum dots driven by DC-AC electric fields is investigated. The time-dependent Schrodinger equation is numerically solved,and Pmin, the minimum probability for the electron and the hole to remain in the initial localized state within 20 periods of the external field,is given. Results show that for a weak field,the exciton mainly oscillates between two localized states; however, for a strong field,the electron and the hole can independently tunnel between the two quantum dots. The driving field tends to drive the electron and the hole apart,and under appropriate conditions they can be localized in the initial state for a short time. The DC field breaks the dynamic symmetry of the system and affects the dynamic localization.
%K Floquet theory
%K quasi-energy
%K localized states
%K dynamical localization<br>Floquet理论
%K 准能
%K 局域态
%K 动态局域化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=025C8057C4D37C4BA0041DC7DE7C758F&aid=777CE43CBEB10414&yid=A732AF04DDA03BB3&vid=D3E34374A0D77D7F&iid=38B194292C032A66&sid=B79ACB6EBBFC9730&eid=0493D643315CD829&journal_id=1674-4926&journal_name=半导体学报&referenced_num=0&reference_num=17