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
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
摘要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.
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.
ZHOU Ben-Liang;LIAO Wen-Hu;ZHOU Guang-Hui;. Conductance of a Quantum Dot in the Presence of a Phonon Field[J]. 中国物理快报, 2008, 25(2): 722-725.
ZHOU Ben-Liang, LIAO Wen-Hu, ZHOU Guang-Hui,. Conductance of a Quantum Dot in the Presence of a Phonon Field. Chin. Phys. Lett., 2008, 25(2): 722-725.
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2008, Vol. 25 
