Berry curvature-induced huge anomalous Nernst effect in the absence of magnetic field in the Weyl semimetal YbMnBi₂

YbMnBi₂, a Type II time-reversal symmetry-breaking Weyl semimetal, yields a huge anomalous Nernst effect (ANE). This ANE is proven to be driven by Berry curvature and is present even in the absence of a magnetic field. The Seebeck thermopower, in contrast, is near zero. By combining magnetoresistance, Hall, Seebeck, and Nernst effects, the actual integral over the Fermi surface of the projection of the Berry phase can be derived. The ANE also results in transverse energy conversion ZT (thermoelectric figure of merit) values that compare favorably to those of conventional thermoelectric materials in the cryogenic temperature range.