在强交变电场驱动下线形三量子点分子中激子的动态局域化行为  

Dynamic behaviours of an exciton confined in coupled quantum dots driven by a high alternating current electrical field

作　　者：刘承师[1] 马本堃[1] 

机构地区：[1]北京师范大学物理系,北京100875

出　　处：《物理学报》2003年第8期2027-2032,共6页Acta Physica Sinica

基　　金：教育部博士点基金 (批准号 :960 0 2 70 3 )资助的课题 .~~

摘　　要：采用三点Hubbard模型和Floquet定理 ,研究了在强交变电场驱动下线形三量子点分子中激子的动力学行为 .数值计算表明 ,尽管驱动电场倾向使电子和空穴在空间上分离 ,但在合适的外电场驱动下 ,初始局域在一个量子点中的电子和空穴依旧保持其初始局域状态 .应用微扰理论求解Floquet方程 ,从而得到准能的解析解 .表明在准能级发生交叉点 ,激子可呈现出动态局域化 .With the three-site Hubbard model and Floquet theorem, we investigate the dynamic behaviours of an exciton confined in three-quantum-dots molecules driven by an alternating current electrical field. The calculations show that the initial localized state is hold up for a certain value of strength and frequency of the alternating current field. In order to understand the dynamical property, we apply the perturbation theory to solve the Floquet function and obtain the analytical solution of quasi-energy. We find that the dynamical localization can be built at the crossing point of quasi-energies for strong and moderate fields.

关 键 词：强交变电场驱动 线形三量子点分子 激子 动力学 数值计算 半导体 电子受限 动态局域化 准能 

分 类 号：O471.1[理学—半导体物理]