Effects of bias on dynamics of an AC-driven two-electron quantum-dot molecule
Wang Li-Min (王立民)a, Duan Su-Qing (段素青)a, Zhao Xian-Geng (赵宪庚)a, Liu Cheng-Shi (刘承师)b
a Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; b The Interdisciplinary Centre of Theoretical Studies, Chinese Academy of Sciences, Beijing 100080, China
Abstract The effects of bias on the dynamical localization of two interacting electrons in a pair of coupled quantum dots driven by external AC fields have been numerically investigated. With an effective two-site model and Floquet formalism, the time-dependent Schr?dinger equation is numerically solved and the Pmin, the minimum of the population evolution of the initial state within a certain time period, is used to quantify the degree of the dynamical localization. Results indicate that the bias can change the energy of the initial state and break the dynamical symmetry of the system with a pure AC field. And the amplitude of the AC field with dynamical localization phenomenon changes with bias. All the numerical results are explained by the perturbation theory and two-level approximation.
Received: 09 July 2004
Revised: 08 October 2004
Accepted manuscript online:
Fund: Project supported jointly by the National Natural Science Foundation of China (Grant Nos 10274007 and 90103027), and by the Doctoral Research Fund For Hebei Normal University.
Cite this article:
Wang Li-Min (王立民), Duan Su-Qing (段素青), Zhao Xian-Geng (赵宪庚), Liu Cheng-Shi (刘承师) Effects of bias on dynamics of an AC-driven two-electron quantum-dot molecule 2005 Chinese Physics 14 409
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