H. Hu, Yiwei Ju, Erjian Cheng, Xiaolong Feng, Fei Sun, Rui Lou, Walter Schnelle, Ralf Koban, Honghui Wang, Alexander Fedorov, Olexandr Suvorov, Anupam Jana, Jun Fujii, I. Vobornik, D. V. Vyalikh, B. Büchner, Bin He, Xiaoqing Pan, Claudia Felser
Abstract 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 LuCo 6 Ge 6 , 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.