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

Author

Listed:
  • Hikari Manako

    (Tokyo University of Science)

  • Shoya Ohsumi

    (Tokyo University of Science)

  • Yoshiki J. Sato

    (Tokyo University of Science
    Saitama University)

  • R. Okazaki

    (Tokyo University of Science)

  • D. Aoki

    (Tohoku University)

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.

Suggested Citation

  • Hikari Manako & Shoya Ohsumi & Yoshiki J. Sato & R. Okazaki & D. Aoki, 2024. "Large transverse thermoelectric effect induced by the mixed-dimensionality of Fermi surfaces," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48217-0
    DOI: 10.1038/s41467-024-48217-0
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    References listed on IDEAS

    as
    1. H. Takahashi & R. Okazaki & S. Ishiwata & H. Taniguchi & A. Okutani & M. Hagiwara & I. Terasaki, 2016. "Colossal Seebeck effect enhanced by quasi-ballistic phonons dragging massive electrons in FeSb2," Nature Communications, Nature, vol. 7(1), pages 1-6, November.
    2. Akito Sakai & Susumu Minami & Takashi Koretsune & Taishi Chen & Tomoya Higo & Yangming Wang & Takuya Nomoto & Motoaki Hirayama & Shinji Miwa & Daisuke Nishio-Hamane & Fumiyuki Ishii & Ryotaro Arita & , 2020. "Iron-based binary ferromagnets for transverse thermoelectric conversion," Nature, Nature, vol. 581(7806), pages 53-57, May.
    3. Yu Pan & Bin He & Toni Helm & Dong Chen & Walter Schnelle & Claudia Felser, 2022. "Ultrahigh transverse thermoelectric power factor in flexible Weyl semimetal WTe2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
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