Large transverse thermoelectric effect induced by the mixed-dimensionality of Fermi surfaces

Hikari Manako, Shoya Ohsumi, Yoshiki J. Sato (), R. Okazaki and D. Aoki
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Hikari Manako: Tokyo University of Science
Shoya Ohsumi: Tokyo University of Science
Yoshiki J. Sato: Tokyo University of Science
R. Okazaki: Tokyo University of Science
D. Aoki: Tohoku University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Transverse thermoelectric effect, the conversion of longitudinal heat current into transverse electric current, or vice versa, offers a promising energy harvesting technology. Materials with axis-dependent conduction polarity, known as p × n-type conductors or goniopolar materials, are potential candidate, because the non-zero transverse elements of thermopower tensor appear under rotational operation, though the availability is highly limited. Here, we report that a ternary metal LaPt2B with unique crystal structure exhibits axis-dependent thermopower polarity, which is driven by mixed-dimensional Fermi surfaces consisting of quasi-one-dimensional hole sheet with out-of-plane velocity and quasi-two-dimensional electron sheets with in-plane velocity. The ideal mixed-dimensional conductor LaPt2B exhibits an extremely large transverse Peltier conductivity up to ∣αyx∣ = 130 A K−1 m−1, and its transverse thermoelectric performance surpasses those of topological magnets utilizing the anomalous Nernst effect. These results thus manifest the mixed-dimensionality as a key property for efficient transverse thermoelectric conversion.

Date: 2024
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DOI: 10.1038/s41467-024-48217-0

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