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arXiv 1908.02665cond-mat.mes-hallcond-mat.str-el
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局部多体相互作用对富勒烯结热电性能的影响

On the role of local many-body interactions on the thermoelectric properties of fullerene junctions

C. A. Perroni, V. Cataudella

摘要:

以富勒烯分子为研究对象,从理论上分析了局域电子振动和电子相互作用对分子结热电性能的影响。一个自洽的绝热方法是为了获得一个非微扰处理的电子耦合到低频振动模式,如金属导线之间的分子质心。该方法还结合了库仑阻塞制度内的分子自由度之间的强电子-电子相互作用的影响。该分析是基于一个一级模型,考虑到相关的运输水平的富勒烯及其对齐的化学势的铅。我们证明,只有本地电子振动和电子-电子相互作用的组合效应是能够预测的电荷电导和塞贝克系数在非常好的协议与现有的实验数据的正确行为。

英文摘要:

The role of local electron-vibration and electron-electron interactions on the thermoelectric properties of molecular junctions is theoretically analyzed focusing on devices based on fullerene molecules. A self-consistent adiabatic approach is used in order to obtain a non-perturbative treatment of the electron coupling to low frequency vibrational modes, such as those of the molecule center of mass between metallic leads. The approach incorporates also the effects of strong electron-electron interactions between molecular degrees of freedom within the Coulomb blockade regime. The analysis is based on a one-level model which takes into account the relevant transport level of fullerene and its alignment to the chemical potential of the leads. We demonstrate that only the combined effect of local electron-vibration and electron-electron interactions is able to predict the correct behavior of both the charge conductance and the Seebeck coefficient in very good agreement with available experimental data.

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