Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride Ta4SiTe4

Le résumé fourni par la source

We investigated the optical properties of single crystals of one-dimensional van der Waals crystal ${\mathrm{Ta}}_{4}{\mathrm{SiTe}}_{4}$, 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 ${\mathrm{Ta}}_{4}{\mathrm{SiTe}}_{4}$ chain is an order of magnitude higher than that perpendicular to this direction, reflecting anisotropic electron conduction in ${\mathrm{Ta}}_{4}{\mathrm{SiTe}}_{4}$. 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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