Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs2

Haihua Hu, Xiaolong Feng, Yu Pan (), Vicky Hasse, Honghui Wang, Bin He () and Claudia Felser ()
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Haihua Hu: Nöthnitzer Str. 40
Xiaolong Feng: Nöthnitzer Str. 40
Yu Pan: Chongqing University
Vicky Hasse: Nöthnitzer Str. 40
Honghui Wang: Nöthnitzer Str. 40
Bin He: Nöthnitzer Str. 40
Claudia Felser: Nöthnitzer Str. 40

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Charge-carrier compensation in topological semimetals amplifies the Nernst signal and simultaneously degrades the Seebeck coefficient. In this study, we report the simultaneous achievement of both a large Nernst signal and an unsaturating magneto-Seebeck coefficient in a topological nodal-line semimetal TaAs2 single crystal. The unique dual-high transverse and longitudinal thermopowers are attributed to multipocket synergy effects: the combination of a strong phonon-drag effect and the two overlapping highly dispersive conduction and valence bands with electron–hole compensation and high mobility, promising a large Nernst effect; the third Dirac band causes a large magneto-Seebeck effect. High transverse and longitudinal power factors of ~3100 and ~50 μW cm−1 K−2, respectively, are achieved, surpassing those of other topological semimetals and mainstream semiconductors. Our study presents a feasible approach for optimizing the longitudinal and transverse thermopowers in topological semimetals simultaneously and demonstrates the potential of TaAs2 for low temperature solid-state cooling.

Date: 2025
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DOI: 10.1038/s41467-024-55490-6

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