Researchers from Japan, led by Associate Professor Ryuji Okazaki, have successfully demonstrated transverse thermoelectric conversion (TTE) in tungsten disilicide (WSi₂), a semimetal with promising applications in energy-efficient devices. Unlike conventional thermoelectric materials that generate electricity along the heat flow, TTE generates voltage perpendicular to it, reducing energy losses and improving efficiency. The team discovered that WSi₂ exhibits axis-dependent conduction polarity (ADCP) due to its unique electronic structure, featuring mixed-dimensional Fermi surfaces that enable direction-specific conductivity. By analyzing WSi₂’s thermopower, resistivity, and thermal conductivity, they linked its TTE effect to charge carrier dynamics and structural imperfections. This breakthrough highlights WSi₂’s potential for advanced sensors and thermoelectric technologies, paving the way for more efficient heat-to-electricity conversion systems and sustainable energy solutions.
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