Methods for enhancing the anomalous Nernst effect in Weyl materials
ORAL
Abstract
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.
*E.B. acknowledges support from the National Science Foundation Graduate Research Fellowship under Grant No. 1752814. V.I. was supported by the U.S. Department of Energy Office of Science, Office of Fusion Energy Sciences, under Contract No. DEAC02-05CH11231. L.Z.T. was supported by the Molecular Foundry, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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Presenters
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Ella Banyas
- University of California, Berkeley