| Dark states and Aharonov-Bohm oscillations in multi-quantum-dot systems |
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| 作者姓名： | 王琼 刘军 唐宁 曾浩生 |
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| 作者单位： | Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,and Department of Physics,Hunan Normal University |
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| 基金项目： | Project supported by the National Basic Research Program of China (Grant No. 2007CB925204), the National Natural Science Foundation of China (Grant No. 10775048), the Key Project of the Chinese Ministry of Education (Grant No. 206103), and the Construct Program of the National Key Discipline. |
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| 摘 要： | We study the formation of dark states and the Aharonov-Bohm effect in symmetrically/asymmetrically coupled three-and four-quantum-dot systems.It is found that without a transverse magnetic field,destructive interference can trap an electron in a dark state.However,the introduction of a transverse magnetic field can disrupt the dark state,giving rise to oscillation in current.For symmetrically structured quantum-dot systems,the oscillation has a period of one flux quanta.But for asymmetrically structured dot systems,the period of oscillation is halved.In addition,the dephasing due to charge noise also blocks the formation of dark states,while it does not change the period of oscillation.
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| 关 键 词： | quantum dot dark state Aharonov-Bohm effect |
| 收稿时间： | 2010-06-12 |
Dark states and Aharonov–Bohm oscillations in multi-quantum-dot systems |
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| Wang Qiong,Liu Jun,Tang Ning and Zeng Hao-Sheng.Dark states and Aharonov-Bohm oscillations in multi-quantum-dot systems[J].Chinese Physics B,2011,20(2):20303-020303. |
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| Authors: | Wang Qiong Liu Jun Tang Ning and Zeng Hao-Sheng |
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| Institution: | Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China;Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China |
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| Abstract: | We study the formation of dark states and the Aharonov--Bohm effect in symmetrically/asymmetrically coupled three- and four-quantum-dot systems. It is found that without a transverse magnetic field, destructive interference can trap an electron in a dark state. However, the introduction of a transverse magnetic field can disrupt the dark state, giving rise to oscillation in current. For symmetrically structured quantum-dot systems, the oscillation has a period of one flux quanta. But for asymmetrically structured dot systems, the period of oscillation is halved. In addition, the dephasing due to charge noise also blocks the formation of dark states, while it does not change the period of oscillation. |
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| Keywords: | quantum dot dark state Aharonov--Bohm effect |
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