非局域铁子拖拽热电效应的观测
Observation of nonlocal ferron-drag thermoelectricity
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中文总结 AI 辅助
研究观测到均匀金属靠近铁电绝缘体时存在非局域铁子拖拽热电效应，揭示了相关相互作用，有望革新热电器件设计。
中文摘要 AI 辅助
珀尔帖效应是当电荷电流通过导体时会诱导出热电流的现象。由于电荷电流在两种不同导体的结处守恒，对于相同电荷电流，两种导体中流动的热量之差会导致界面的加热或冷却，这为固态热泵提供了工作机制。在此，我们报告即使在无结的均匀金属靠近铁电绝缘体时，也能观测到热吸收和释放信号。我们使用主动热成像技术的实验证实了铁子拖拽效应的预测，即相邻金属中的传导电子会非局域激发铁子——铁电极序的集体激发。我们揭示了温度变化信号与电极化方向的依赖关系，以及其在金属厚度超过电荷屏蔽长度时的意外增加，这揭示了金属/铁电混合结构中额外的电子-声子-铁子相互作用。金属与铁电体通过远程铁子产生的串扰的发现，对于带有铁电势垒材料的高度集成电路而言可能既是麻烦也是机遇，并将革新热电器件的设计架构。
英文摘要
The Peltier effect induces a heat current when a charge current passes through a conductor. Since a charge current is conserved at the junction between two different conductors, the difference between the heat flowing in both conductors for the same charge current leads to heating or cooling of the interface, providing an operating mechanism of solid-state heat pumps. Here, we report observation of heat absorption and release signals even in a junction-free, homogeneous metal when placed in proximity to a ferroelectric insulator. Our experiments using active thermographic imaging techniques confirm the prediction of the ferron-drag effect, i.e., the nonlocal excitation of ferrons, the collective excitation of the ferroelectric order, by conduction electrons in the adjacent metal. We reveal the electric-polarization-direction dependence of the temperature change signals and their unexpected increase with the metal thickness beyond the charge screening length, uncovering additional electron-phonon-ferron interactions in the metal/ferroelectric hybrid structure. The discovery of crosstalk between metals and ferroelectrics via remote ferrons could become both a nuisance and an opportunity for highly integrated circuits with ferroelectric barrier materials and revolutionize the design architecture of thermoelectric devices.
