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The manifestation of Weyl fermions in strongly correlated electron systems isof particular interest. We report evidence for Weyl fermions in the heavyfermion semimetal YbPtBi from electronic structure calculations, angle-resolvedphotoemission spectroscopy, magnetotransport and calorimetric measurements. Atelevated temperatures where $4f$-electrons are localized, there are triplydegenerate points, yielding Weyl nodes in applied magnetic fields. These arerevealed by a contribution from the chiral anomaly in the magnetotransport,which at low temperatures becomes negligible due to the influence of electroniccorrelations. Instead, Weyl fermions are inferred from the topological Halleffect, which provides evidence for a Berry curvature, and a cubic temperaturedependence of the specific heat, as expected from the linear dispersion nearthe Weyl nodes. The results suggest that YbPtBi is a Weyl heavy fermionsemimetal, where the Kondo interaction renormalizes the bands hosting Weylpoints. These findings open up an opportunity to explore the interplay betweentopology and strong electronic correlations.

Evidence for Weyl fermions in a canonical heavy-fermion semimetal YbPtBi