Geometric Symmetry Breaking and Nonlinearity Can Increase Thermoelectric Power,Physical Review Letters

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Geometric Symmetry Breaking and Nonlinearity Can Increase Thermoelectric Power
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-11 , DOI: 10.1103/physrevlett.133.116302
Jonatan Fast _{1,

1} , Hanna Lundström _{1,

1} , Sven Dorsch _{1,

1} , Lars Samuelson _{1,

1,

2} , Adam Burke _{1,

1} , Peter Samuelsson _{1,

1} , Heiner Linke _{1,

1}

Affiliation

Direct thermal-to-electric energy converters typically operate in the linear regime, where the ratio of actual maximum power relative to the ideal maximum power, the so-called fill factor (FF), is 0.25. Here, we show, based on fundamental symmetry considerations, that the leading order nonlinear terms that can increase the FF require devices with broken spatial symmetry. Studying nonlinear, thermoelectric transport across an asymmetric energy barrier defined in a single semiconductor nanowire, we find in both experiment and theory that we can increase the FF as well as maximum power. Geometric symmetry breaking combined with the design of nonlinear behavior thus represents a strategy for increasing the performance of thermoelectric or hot-carrier devices.

Published by the American Physical Society

2024

中文翻译：

几何对称性打破和非线性可以增加热电功率

直接热电能转换器通常在线性状态下运行，其中实际最大功率与理想最大功率之比，即所谓的填充因子（FF），为 0.25。在这里，我们根据基本的对称性考虑表明，可以增加 FF 的前导阶非线性项需要具有打破空间对称性的器件。通过研究单个半导体纳米线中定义的不对称能垒的非线性热电传输，我们在实验和理论中发现，我们可以增加 FF 以及最大功率。因此，几何对称性打破与非线性行为设计相结合，代表了一种提高热电或热载流子器件性能的策略。美国物理学会 2024 年出版

更新日期：2024-09-11

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