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arXiv 1704.04064cond-mat.mes-hall
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大功率库仑阻力热电发动机

Powerful Coulomb-drag thermoelectric engine

A. -M. Daré, P. Lombardo

摘要:

我们研究了一种热电纳米发动机,其性质由库仑相互作用控制。该装置的设计将电荷和能量流结合起来,由两个相互作用的量子点连接到三个不同的储存器。我们表明,通过调整隧道耦合,这种设置可以非常有吸引力的能量收集的前景,由于提供的功率可以是量子束缚的顺序[R。S. Whitney,Phys. Rev. Lett. 112,130601(2014);熵18,208(2016)],伴随着公平的效率。为了揭示其性质超出了顺序的量子主方程,我们采用非平衡非交叉近似的Keldysh格林函数形式主义,和量子主方程,包括cotunneling过程。这两种方法是相当定性相似的一个大的操作制度,顺序隧道单独失败。

英文摘要:

We investigate a thermoelectric nano-engine whose properties are steered by Coulomb interaction. The device whose design decouples charge and energy currents is made up of two interacting quantum dots connected to three different reservoirs. We show that, by tailoring the tunnel couplings, this setup can be made very attractive for energy-harvesting prospects, due to a delivered power that can be of the order of the quantum bound [R. S. Whitney, Phys. Rev. Lett. 112, 130601 (2014); Entropy 18, 208 (2016)], with a concomitant fair efficiency. To unveil its properties beyond the sequential quantum master equation, we apply a nonequilibrium noncrossing approximation in the Keldysh Green's function formalism, and a quantum master equation that includes cotunneling processes. Both approaches are rather qualitatively similar in a large operating regime where sequential tunneling alone fails.

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