Enhanced anomalous Nernst effect in disordered Dirac and Weyl materials
Micha{\l} Papaj, Liang Fu
TL;DR
This paper investigates how extrinsic scattering mechanisms like skew-scattering and side jump significantly enhance the anomalous Nernst effect in disordered Dirac and Weyl materials, explaining their strong thermoelectric responses.
Contribution
It provides a semiclassical analysis of extrinsic contributions to the Nernst effect in Dirac and Weyl semimetals, highlighting their importance in thermoelectric response.
Findings
Extrinsic effects can dominate the anomalous Nernst response.
Enhanced thermoelectric response explained by skew-scattering and side jump.
Applicable to specific materials like Fe$_3$Sn$_2$ and Co$_3$Sn$_2$S$_2$.
Abstract
We analyze the thermoelectric response of Dirac and Weyl semimetals using the semiclassical approach, focusing on the extrinsic contributions due to skew-scattering and side jump. Our results apply to linear response Nernst effect in ferromagnetic Dirac materials such as FeSn, Weyl semimetal CoSnS and to second order response of monolayer graphene on hBN with trigonal warping. Our analysis indicates that the extrinsic contributions can be a significant component of anomalous Nernst response and used to explain an enhanced thermoelectric response.
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