Anisotropic optical conductivity accompanied by a small energy gap in the one-dimensional thermoelectric telluride Ta4SiTe4
Source abstract
Abstract
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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · 2D Materials and Applications · Topological Materials and Phenomena
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464–8603, Japan
Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa 277–8581, Japan
National Institute for Materials Science (NIMS), Sakura 3–13, Tsukuba 305-0003, Japan
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804–8550, Japan
Funding
Japan Society for the Promotion of Science · Japan Science and Technology Corporation · Research Foundation for the Electrotechnology of Chubu · University of Tokyo
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