| Ac response of a coupled double quantum dot |
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| 引用本文： | 徐婕,W.Z.Shangguan,詹士昌. Ac response of a coupled double quantum dot[J]. 中国物理, 2005, 14(10): 2093-2099 |
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| 作者姓名： | 徐婕 W.Z.Shangguan 詹士昌 |
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| 作者单位： | Department of Physics, Institute of Microfluidic Chip, Hangzhou Teacher's College, Hangzhou 310012, China;School of Electrical and Electronic Engineering, Nanyang TechnologicalUniversity, Singapore 639798;Department of Physics, Institute of Microfluidic Chip, Hangzhou Teacher's College, Hangzhou 310012, China |
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| 摘 要： |
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| 关 键 词： | Ac响应 量子点 电子传播 光电子 微分电导 |
| 收稿时间： | 2005-03-29 |
| 修稿时间： | 2005-06-01 |
Ac response of a coupled double quantum dot |
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| Xu Jie,Shangguan W. Z. and Zhan Shi-Chang. Ac response of a coupled double quantum dot[J]. Chinese Physics, 2005, 14(10): 2093-2099 |
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| Authors: | Xu Jie Shangguan W. Z. Zhan Shi-Chang |
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| Affiliation: | Department of Physics, Institute of Microfluidic Chip, Hangzhou Teacher's College, Hangzhou 310012, China; School of Electrical and Electronic Engineering, Nanyang TechnologicalUniversity, Singapore 639798 |
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| Abstract: | The effect of phase-breaking process on the ac response of a coupled double quantum dot is studied in this paper based on the nonequilibrium Green function formalism. A general expression is derived for the ac current in the presence of electron--phonon interaction. The ac conductance is numerically computed and the results are compared with those in [Anatram M P and Datta S 1995 Phys. Rev. B 51 7632]. Our results reveal that the inter-dot electron tunnelling interplays with that between dots and electron reservoirs, and contributes prominently to the ac current when inter-dot tunnelling coupling is much larger than the tunnelling coupling between dots and electron reservoirs. In addition, the phase-breaking process is found to have a significant effect on the ac transport through the coupled double dot. |
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| Keywords: | electronic transport electron-phonon interaction differential conductance Keldysh Green's function |
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