Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs₂.

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

SUBMITTER: Hu H 

PROVIDER: S-EPMC11696835 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature