2025-11-03 理化学研究所
Web要約 の発言：
キラル熱電ホール効果の模式図（▽T：温度勾配、E：電場、JNCTE：ホール電流）
＜関連情報＞
- https://www.riken.jp/press/2025/20251103_1/index.html
- https://www.nature.com/articles/s41567-025-03073-7
テルルにおける非線形カイラル熱電ホール効果の観測 Observation of the nonlinear chiral thermoelectric Hall effect in tellurium
Tetsuya Nomoto,Akiko Kikkawa,Kazuki Nakazawa,Terufumi Yamaguchi & Fumitaka Kagawa
Nature Physics Published:03 November 2025
DOI:https://doi.org/10.1038/s41567-025-03073-7
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.
