近日，日本理研新兴物质科学中心（CEMS）Kagawa, Fumitaka团队研究了碲中非线性手性热电霍尔效应的观察。这一研究成果于2025年11月3日发表在《自然—物理学》杂志上。

非线性热电效应是某些热电现象的基础，如热整流和使用发电热波动。最近的理论进展表明，手性材料可以表现出由逆对称破缺引起的奇异非线性热电输运。然而，实验证明尚未实现。

研究组报道了在室温下手性碲中非线性手性热电霍尔效应的观察，其中电压是温度梯度和电场的叉乘产生的。所得的热电霍尔电压为微伏数量级，与从头计算的预测一致。此外，热电霍尔电压的符号取决于晶体的手性，突出了通过手性自由度控制热电效应符号的功能。该发现揭示了手性系统作为先进热管理和能量收集的非线性热电材料的潜力。

附：英文原文

Title: Observation of the nonlinear chiral thermoelectric Hall effect in tellurium

Author: Nomoto, Tetsuya, Kikkawa, Akiko, Nakazawa, Kazuki, Yamaguchi, Terufumi, Kagawa, Fumitaka

Issue&Volume: 2025-11-03

Abstract: The nonlinear thermoelectric effect lies at the basis for certain thermoelectric phenomena, such as heat rectification and power generation using thermal fluctuations. Recent theoretical advances have indicated that chiral materials can display exotic nonlinear thermoelectric transport arising from inversion-symmetry breaking. However, an experimental demonstration has yet to be achieved. Here we report the observation of the nonlinear chiral thermoelectric Hall effect in chiral tellurium at room temperature, where a voltage is generated as a cross product of the temperature gradient and the electric field. The resulting thermoelectric Hall voltage is of the order of microvolts, consistent with the prediction from ab initio calculations. Furthermore, the sign of the thermoelectric Hall voltage depends on the chirality of the crystal, highlighting the functionality of controlling the sign of the thermoelectric effect through chiral degrees of freedom. Our findings reveal the potential of chiral systems as nonlinear thermoelectric materials for advanced thermal management and energy harvesting.

DOI: 10.1038/s41567-025-03073-7

Source: https://www.nature.com/articles/s41567-025-03073-7