Anisotropic Optical Conductivity Accompanied by a Small Energy Gap in One-Dimensional Thermoelectric Telluride Ta4SiTe4
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arXiv
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| Format: | Preprint |
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2023
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| author | Matsunaga, Fumiya Okamoto, Yoshihiko Yokoyama, Yasunori Takehana, Kanji Imanaka, Yasutaka Nakamura, Yuto Kishida, Hideo Kawano, Shoya Matsuhira, Kazuyuki Takenaka, Koshi |
| author_facet | Matsunaga, Fumiya Okamoto, Yoshihiko Yokoyama, Yasunori Takehana, Kanji Imanaka, Yasutaka Nakamura, Yuto Kishida, Hideo Kawano, Shoya Matsuhira, Kazuyuki Takenaka, Koshi |
| contents | We investigated the optical properties of single crystals of one-dimensional telluride Ta4SiTe4, which shows 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 the anisotropic electron conduction in Ta4SiTe4. These results indicate that coexistence of a very small band gap and anisotropic electron conduction is a promising strategy to develop a high-performance thermoelectric material for low temperature applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_13031 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Anisotropic Optical Conductivity Accompanied by a Small Energy Gap in One-Dimensional Thermoelectric Telluride Ta4SiTe4 Matsunaga, Fumiya Okamoto, Yoshihiko Yokoyama, Yasunori Takehana, Kanji Imanaka, Yasutaka Nakamura, Yuto Kishida, Hideo Kawano, Shoya Matsuhira, Kazuyuki Takenaka, Koshi Materials Science We investigated the optical properties of single crystals of one-dimensional telluride Ta4SiTe4, which shows 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 the anisotropic electron conduction in Ta4SiTe4. These results indicate that coexistence of a very small band gap and anisotropic electron conduction is a promising strategy to develop a high-performance thermoelectric material for low temperature applications. |
| title | Anisotropic Optical Conductivity Accompanied by a Small Energy Gap in One-Dimensional Thermoelectric Telluride Ta4SiTe4 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2311.13031 |