| Effects of bias on dynamics of an AC-driven two-electron quantum-dot molecule |
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| 引用本文： | 王立民,段素青,赵宪庚,刘承师. Effects of bias on dynamics of an AC-driven two-electron quantum-dot molecule[J]. 中国物理, 2005, 14(2): 409-419 |
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| 作者姓名： | 王立民 段素青 赵宪庚 刘承师 |
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| 作者单位： | Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;The Interdisciplinary Centre of Theoretical Studies, Chinese Academy of Sciences, Beijing 100080, China |
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| 基金项目： | 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. |
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| 摘 要： | 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 Schroedinger 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.
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| 关 键 词： | 力学局部化 量子点分子 准能量 Floquet 量子态 |
| 收稿时间： | 2004-07-09 |
Effects of bias on dynamics of an AC-driven two-electron quantum-dot molecule |
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| Wang Li-Min,Duan Su-Qing,Zhao Xian-Geng and Liu Cheng-Shi. Effects of bias on dynamics of an AC-driven two-electron quantum-dot molecule[J]. Chinese Physics, 2005, 14(2): 409-419 |
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| Authors: | Wang Li-Min Duan Su-Qing Zhao Xian-Geng Liu Cheng-Shi |
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| Affiliation: | Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; The Interdisciplinary Centre of Theoretical Studies, Chinese Academy of Sciences, Beijing 100080, China |
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| 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. |
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| Keywords: | dynamical localization quantum dots quasi-energy Floquet state |
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