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Conductance of a Quantum Dot in the Presence of a Phonon Field |
ZHOU Ben-Liang1;LIAO Wen-Hu1;ZHOU Guang-Hui1,2 |
1Department of Physics, Hunan Normal University, Changsha 4100812International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015 |
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Cite this article: |
ZHOU Ben-Liang, LIAO Wen-Hu, ZHOU Guang-Hui 2008 Chin. Phys. Lett. 25 722-725 |
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Abstract We theoretically investigate the electrical transport property of a quantum dot with longitudinal optical phonons. The conductance through the dot connected to two leads is calculated by the nonequilibrium Green function within the Landauer--Buttiker framework. The numerical examples of the conductance with different electron--phonon coupling strengths show that the presence of a phonon field typically results in the suppression of the main peak accompanied by some phonon side peaks. Both the main peak and the side peaks are sensitive to the electron--phonon coupling strength, which is related to temperature. Our results for this system are consistent with some related previous works but the calculation is comparatively simple.
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Keywords:
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63.20.Kr
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Received: 07 June 2007
Published: 30 January 2008
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