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<p>Based on atomistic calculation of electronic transport, we propose a new recipe to enhance the thermoelectric power factor by utilizing the exotic transport of Weyl point fermions. The Weyl semimetal SrSi<sub>2</sub> is used as an example to illustrate the underlying correlation. We find that (i) the twofold degenerate Weyl point helps to produce the peak Seebeck coefficient, resulting in a peak and enhanced power factor, (ii) the eliminated degeneracy of physical spin under spin–orbit coupling significantly reduces the Seebeck coefficient, and (iii) if the Weyl point is opened with a significant gap, both the Seebeck coefficient and electrical conductance are decreased, which in turn indicates a direct correlation between the presence of Weyl points and improved thermoelectric performance.</p>

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Weyl Point Fermion as a New Route to Enhance Thermoelectric Power Factor

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Xiang Hu,
  • Jing Zhou,
  • Cong Wang,
  • Guangqian Ding

摘要

Based on atomistic calculation of electronic transport, we propose a new recipe to enhance the thermoelectric power factor by utilizing the exotic transport of Weyl point fermions. The Weyl semimetal SrSi2 is used as an example to illustrate the underlying correlation. We find that (i) the twofold degenerate Weyl point helps to produce the peak Seebeck coefficient, resulting in a peak and enhanced power factor, (ii) the eliminated degeneracy of physical spin under spin–orbit coupling significantly reduces the Seebeck coefficient, and (iii) if the Weyl point is opened with a significant gap, both the Seebeck coefficient and electrical conductance are decreased, which in turn indicates a direct correlation between the presence of Weyl points and improved thermoelectric performance.