Methods for enhancing the anomalous Nernst effect in Weyl materials*

The anomalous Nernst effect (ANE) is a thermoelectric transport phenomenon that is closely related to the anomalous Hall effect. Both effects are significantly enhanced in the presence of large Berry curvatures. As Weyl nodes are associated with Berry curvature singularities, Weyl semimetals are promising candidates for realizing large ANE currents and are thus exciting targets for various functional applications. Here we introduce a method for enhancing ANE signals by inducing constructive superposition of opposite-chirality Weyl nodes via a magnetic field. We illustrate this effect with multi-band models, discuss some design principles for magnetic topological materials which may exhibit this effect, and present density functional theory results for selected candidate materials.