Quantum control of nonlinear thermoelectricity at the nanoscale
Quantum control of nonlinear thermoelectricity at the nanoscale
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DOI：
10.1103/physrevb.101.115404
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发表时间：
2019-12
影响因子：
3.7
通讯作者：
N. Taniguchi
中科院分区：
文献类型：
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作者：
N. Taniguchi
我们从理论上研究了如何通过调节纳米结构（如量子点系统或单分子结）中的量子相干性来控制和增强非线性热电性。在纳米结构中，典型的温度尺度远小于谐振宽度，这在很大程度上抑制了热电效应。然而，我们证明了可以通过调节量子相干性来实现相当好的热电性能。利用量子点干涉仪（嵌入环形几何结构中的量子点）作为热机，我们探索了由Fano共振引起的热电增强的想法。我们开发了一个完全非线性响应的点或没有强相互作用的分析处理。基于非平衡绿色函数技术的微观模型，我们展示了如何提高效率和/或输出功率，以及在哪里找到一个最佳的栅极电压。我们还讨论了如何评估非线性热电的线性响应量。
We theoretically study how one can control and enhance nonlinear thermoelectricity by regulating quantum coherence in nanostructures such as a quantum dot system or a single-molecule junction. In nanostructures, the typical temperature scale is much smaller than the resonance width, which largely suppresses thermoelectric effects. Yet we demonstrate one can achieve a reasonably good thermoelectric performance by regulating quantum coherence. Engaging a quantum-dot interferometer (a quantum dot embedded in the ring geometry) as a heat engine, we explore the idea of thermoelectric enhancement induced by the Fano resonance. We develop an analytical treatment of fully nonlinear responses for a dot with or without strong interaction. Based on the microscopic model with the nonequilibrium Green function technique, we show how to enhance efficiency and/or output power as well as where to locate an optimal gate voltage. We also argue how to assess nonlinear thermoelectricity by linear-response quantities.