Semiclassical thermoelectric transport in the disordered Dirac electron system <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>Ag</mi><mn>2</mn></msub><mi>Te</mi></mrow></math>

Kentaro Kuga; Keisuke Hirata; Daiki Goto; Ryogo Ishihara; Masaharu Matsunami; Tsunehiro Takeuchi

doi:10.1103/3lb4-pnvx

Semiclassical thermoelectric transport in the disordered Dirac electron system ${Ag}_{2} Te$

Kentaro Kuga ^1,2,3,4,*, Keisuke Hirata ^1,3, Daiki Goto¹, Ryogo Ishihara ¹, Masaharu Matsunami ^1,2,3,5, and Tsunehiro Takeuchi ^1,2,3,5,6

¹Toyota Technological Institute, Nagoya, Aichi 468-8511, Japan
²CREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0076, Japan
³MIRAI, Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0076, Japan
⁴Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
⁵Research Center for Smart Energy Technology, Toyota Technological Institute, Nagoya, Aichi 468-8511, Japan
⁶Institute of Innovation for Future Society, Nagoya University, Nagoya, Aichi 464-8603, Japan

^*Contact author: k.kuga@hirosaki-u.ac.jp

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Phys. Rev. B 114, 154203 – Published 4 September, 2026

DOI: https://doi.org/10.1103/3lb4-pnvx

Abstract

We investigated the thermoelectric effects of the Dirac electron system ${Ag}_{2} Te$ under magnetic field. Our analysis based on the Boltzmann semiclassical model associated the disorder with the unconventional magnetic field responses such as linear magnetoresistance, linear Nernst effect, steplike Nernst effect, and sign change in Nernst effect. The analysis also revealed the impurity band near the Fermi energy. We simultaneously clarified the serious impact of the thermal Hall effect on the measurement of the Nernst effect, and we proposed the definitive solution. Our careful measurement and analysis will be the standard for the thermoelectric study under magnetic field.

Physical Review B

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Semiclassical thermoelectric transport in the disordered Dirac electron system ${Ag}_{2} Te$

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Semiclassical thermoelectric transport in the disordered Dirac electron system Ag2Te

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Semiclassical thermoelectric transport in the disordered Dirac electron system ${Ag}_{2} Te$