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<p>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.</p>

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Observation of the nonlinear chiral thermoelectric Hall effect in tellurium

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Tetsuya Nomoto,
  • Akiko Kikkawa,
  • Kazuki Nakazawa,
  • Terufumi Yamaguchi,
  • Fumitaka Kagawa

摘要

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.