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<p>The exotic geometry of the kagome lattice drives emergent quantum states and advances energy technologies; however, the anomalous Nernst effect (ANE)-based magnetic systems are fundamentally limited by low thermopowers (&lt;6μ V K<sup>−1</sup>) and stray-field interference. Here we propose goniopolarity (axis-dependent carrier polarity) to achieve high zero-field transverse thermoelectric responses in kagome systems. By exploiting flat-band- and van Hove singularity-driven electronic states, we uncover exceptionally large goniopolar thermoelectric responses in LuCo<sub>6</sub>Ge<sub>6</sub>, including a transverse thermopower of 18.4 μV K<sup>−1</sup> and a transverse Peltier conductivity of 105 A m<sup>−1</sup> K<sup>−1</sup> at room temperature and zero field. The synergy of flat bands with high electrical conductivity yields values an order of magnitude greater than those achieved in conventional ANE-based systems. Our findings establish goniopolar kagome metals as promising candidates for thermoelectrics.</p>

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Fermiology-driven goniopolar transverse thermoelectricity in kagome metals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月31日

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  • Haihua Hu,
  • Yiwei Ju,
  • Erjian Cheng,
  • Xiaolong Feng,
  • Fei Sun,
  • Rui Lou,
  • Walter Schnelle,
  • Ralf Koban,
  • Honghui Wang,
  • Alexander Fedorov,
  • Oleksandr Suvorov,
  • Anupam Jana,
  • Jun Fujii,
  • Ivana Vobornik,
  • Denis V. Vyalikh,
  • Bernd Büchner,
  • Bin He,
  • Xiaoqing Pan,
  • Claudia Felser

摘要

The exotic geometry of the kagome lattice drives emergent quantum states and advances energy technologies; however, the anomalous Nernst effect (ANE)-based magnetic systems are fundamentally limited by low thermopowers (<6μ V K−1) and stray-field interference. Here we propose goniopolarity (axis-dependent carrier polarity) to achieve high zero-field transverse thermoelectric responses in kagome systems. By exploiting flat-band- and van Hove singularity-driven electronic states, we uncover exceptionally large goniopolar thermoelectric responses in LuCo6Ge6, including a transverse thermopower of 18.4 μV K−1 and a transverse Peltier conductivity of 105 A m−1 K−1 at room temperature and zero field. The synergy of flat bands with high electrical conductivity yields values an order of magnitude greater than those achieved in conventional ANE-based systems. Our findings establish goniopolar kagome metals as promising candidates for thermoelectrics.