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Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ta</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>SiTe</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
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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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- 08/04/2024
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PhysRevB.109.L161105.pdf | 683 KB | MDR Open |
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