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Fermiology-driven goniopolar transverse thermoelectricity in kagome metals
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DOI：10.1038/s41563-026-02678-4.png)
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Abstract
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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. Axis-dependent carrier polarity, in combination with flat-band and van Hove singularity states, enable transverse thermopower of 18.4 μV K−1 and transverse Peltier conductivity of 105 A m−1 K−1 at room temperature and zero field in LuCo6Ge6.
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