Phonon-assisted thermoelectric effects in strongly interacting quantum dot |
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Authors: | Kai-Hua Yang Ya-Liang Zhao Yan-Ju Wu Yu-Peng Wu |
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Institution: | College of Applied Sciences, Beijing University of Technology, Beijing 100124, China |
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Abstract: | The joint effects of the electron-phonon interaction and Kondo effect on the charge and heat transport through a single molecule transistor are investigated by applying the improved canonical transformation and noncrossing approximation technique. We find that the electron-phonon interaction decreases the conductance, thermopower and the Wiedemann-Franz law in the Kondo regime due to the splitting and the decreasing of the main Kondo peak. However, the thermoelectric figure of merit achieves enhancement with the electron-phonon coupling strength increasing. In addition, the dip value of the thermopower at the Kondo temperature for the different electron-phonon coupling strength can give a straightforward reliable estimate of the electron-phonon coupling strength. |
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Keywords: | Thermoelectric effects Polarons and electron-phonon interactions Kondo effect Quantum dots |
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