| Phonon-Assisted Resonant Tunnelling through a Triple-Quantum-Dot： a Phonon-Signal Detector |
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| 引用本文： | 沈晓耘,董兵,雷啸霖.Phonon-Assisted Resonant Tunnelling through a Triple-Quantum-Dot： a Phonon-Signal Detector[J].中国物理快报,2008,25(2):683-686. |
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| 作者姓名： | 沈晓耘 董兵 雷啸霖 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No , the Shanghai Municipal Commission of Science and Technology under Grant No , the Shanghai Pujiang Programme under Grant No , and the New Century Excellent Talent Project （NCET） of the Ministry of Education of China under Grant No . |
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| 摘 要： | We study the effect of electron-phonon interaction on current and zero-frequency shot noise in resonant tunnelling through a series triple-quantum-dot coupling to a local phonon mode by means of a nonperturbative mapping technique along with the Green function formulation. By fixing the energy difference between the first two quantum dots to be equal to phonon frequency and sweeping the level of the third quantum dot, we find a largely enhanced current spectrum due to phonon effect, and in particular we predict current peaks corresponding to phonon-absorption and phonon-emission assisted resonant tunnelling processes, which show that this system can be acted as a sensitive phonon-signal detector or as a cascade phonon generator.
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| 关 键 词： | 声子信号探测器 量子点 声子共振隧道效应 电子-声子相互作用 |
| 收稿时间： | 2007-4-11 |
Phonon-Assisted Resonant Tunnelling through a Triple-Quantum-Dot: a Phonon-Signal Detector |
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| SHEN Xiao-Yun,DONG Bing,LEI Xiao-lin.Phonon-Assisted Resonant Tunnelling through a Triple-Quantum-Dot: a Phonon-Signal Detector[J].Chinese Physics Letters,2008,25(2):683-686. |
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| Authors: | SHEN Xiao-Yun DONG Bing LEI Xiao-lin |
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| Affiliation: | Department of Physics, Shanghai diaotong University, 1954 Huashan Road, Shanghai 200030 |
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| Abstract: | We study the effect of electron--phonon interaction on current and zero-frequency shot noise in resonant tunnelling through a series triple-quantum-dot coupling to a local phonon mode by means of a nonperturbative mappingtechnique along with the Green function formulation. By fixing the energy difference between the first two quantum dots to be equal to phonon frequency and sweeping the level of the third quantum dot, we find a largely enhanced current spectrum due to phonon effect, and in particular we predict current peaks corresponding to phonon-absorption and phonon-emission assisted resonant tunnelling processes, which show that this system can be acted as a sensitive phonon-signal detector or as a cascade phonon generator. |
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| Keywords: | 73 63 Kv 71 33 -k 73 50 Td |
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