Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride <math>
  <mrow>
    <msub>
      <mi>Ta</mi>
      <mn>4</mn>
    </msub>
    <msub>
      <mi>SiTe</mi>
      <mn>4</mn>
    </msub>
  </mrow>
</math>

Fumiya Matsunaga; Yoshihiko Okamoto; Yasunori Yokoyama; Kanji Takehana; Yasutaka Imanaka; Yuto Nakamura; Hideo Kishida; Shoya Kawano; Kazuyuki Matsuhira; Koshi Takenaka

doi:10.1103/physrevb.109.l161105

Journal article Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride ${Ta}_{4} {SiTe}_{4}$

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Fumiya Matsunaga, Yoshihiko Okamoto, Yasunori Yokoyama, Kanji Takehana, Yasutaka Imanaka, Yuto Nakamura, Hideo Kishida, Shoya Kawano, Kazuyuki Matsuhira, Koshi Takenaka. Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride

{Ta}_{4} {SiTe}_{4}

. Physical Review B. 2024, 109 (16), L161105. https://doi.org/10.1103/physrevb.109.l161105

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(abstract)

We investigated the optical properties of single crystals of one-dimensional van der Waals crystal Ta4SiTe4, which exhibited high thermoelectric performance below room temperature. Optical conductivity estimated from reflectivity spectra indicates the presence of a small energy gap of 0.1–0.15 eV at the Fermi energy. At the lowest energy, optical conductivity along the Ta4SiTe4 chain is an order of magnitude higher than that perpendicular to this direction, reflecting anisotropic electron conduction in Ta4SiTe4 . These results suggest that the coexistence of a small band gap and moderate anisotropy in electron conduction is a promising strategy for developing high-performance thermoelectric materials for low-temperature applications.

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Keyword: Optical Conductivity, van der Waals, one-dimensional

Date published: 2024-04-08

Publisher: American Physical Society (APS)

Journal:

Physical Review B (ISSN: 24699950) vol. 109 issue. 16 L161105

Funding:

Japan Society for the Promotion of Science 19H05823
Japan Society for the Promotion of Science 20H00346
Japan Society for the Promotion of Science 20H02603
Japan Society for the Promotion of Science 22H04953
Japan Society for the Promotion of Science 23H01831
Japan Society for the Promotion of Science 23H04871
Japan Science and Technology Corporation JPMJAP2314
Research Foundation for the Electrotechnology of Chubu
University of Tokyo

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1103/physrevb.109.l161105

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Updated at: 2024-04-12 08:30:12 +0900

Published on MDR: 2024-04-12 08:30:13 +0900

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