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arXiv 1301.3307cond-mat.str-el
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量子点的非线性热电响应:重正化对偶费米子脱离平衡态

Nonlinear thermoelectric response of quantum dots: renormalized dual fermions out of equilibrium

Stefan Kirchner, Farzaneh Zamani, Enrique Muñoz

摘要:

纳米结构器件的热电输运性质继续吸引理论家和实验学家的关注,因为空间限制允许相关物质的输运性质的受控方法。然而,大多数现有的工作,集中在热电输运的线性政权,尽管事实上,相关的量子点的非线性电导已经在过去的十年中进行了一些详细的研究。在这里,我们回顾了我们最近的工作的粒子-空穴不对称性的影响的非线性输运性质在附近的近藤相关量子点的强耦合极限和扩展的基本方法,重整化超微扰理论的Keldysh轮廓,在非线性制度的热导。我们确定的电荷,能量和热流通过纳米结构和研究的非线性传输系数,熵产生,和命运的Wiedemann-Franz法在非热稳态。我们的方法是基于重正化微扰理论在周围的粒子-空穴对称强耦合限制的对偶费米子。

英文摘要:

The thermoelectric transport properties of nanostructured devices continue to attract attention from theorists and experimentalist alike as the spatial confinement allows for a controlled approach to transport properties of correlated matter. Most of the existing work, however, focuses on thermoelectric transport in the linear regime despite the fact that the nonlinear conductance of correlated quantum dots has been studied in some detail throughout the last decade. Here, we review our recent work on the effect of particle-hole asymmetry on the nonlinear transport properties in the vicinity of the strong coupling limit of Kondo-correlated quantum dots and extend the underlying method, a renormalized superperturbation theory on the Keldysh contour, to the thermal conductance in the nonlinear regime. We determine the charge, energy, and heat current through the nanostructure and study the nonlinear transport coefficients, the entropy production, and the fate of the Wiedemann-Franz law in the non-thermal steady-state. Our approach is based on a renormalized perturbation theory in terms of dual fermions around the particle-hole symmetric strong-coupling limit.

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