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arXiv 1101.4124cond-mat.mes-hallcond-mat.str-el
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负U分子量子点中大热电势的机理

Mechanism for large thermoelectric power in negative-U molecular quantum dots

S. Andergassen, T. A. Costi, V. Zlatic

摘要:

利用数值重整化群方法研究了负U Anderson模型下分子量子点的热电性质。我们发现,电荷近藤效应提供了一种机制,通过相关诱导的非对称性的光谱函数接近费米能级的热电功率增强。我们发现,这种效果的结果在一个显着增强的近藤诱导峰的热电势的负U系统的塞贝克系数超过50 $μV/K$在很宽的范围内的栅极电压。

英文摘要:

We investigate with the aid of numerical renormalization group techniques the thermoelectric properties of a molecular quantum dot described by the negative-U Anderson model. We show that the charge Kondo effect provides a mechanism for enhanced thermoelectric power via a correlation induced asymmetry in the spectral function close to the Fermi level. We show that this effect results in a dramatic enhancement of the Kondo induced peak in the thermopower of negative-U systems with Seebeck coefficients exceeding 50$μV/K$ over a wide range of gate voltages.

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