Article Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride Ta 4 SiTe 4

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

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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
SAMURAI

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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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