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The Ce(Co,Rh,Ir)In$_5$ family of ``Ce-115'' materials hosts an abundance ofcorrelated electron behavior, including heavy-fermion physics, magnetism,superconductivity and nematicity. The complicated behavior of these entangledphenomena leads to a variety of exotic physical properties, which, despite theseemingly simple crystal structure of these compounds, remain poorlyunderstood. It is generally accepted that the interplay between the itinerantand local character of Ce-$4f$ electrons is the key to their exotic behavior.Here, we report theoretical evidence that the Ce-115 materials are alsotopological semi-metals, with Dirac fermions around well-separated nodes. Diracnodes in each compound are present on the $\Gamma-Z$ plane close to the Fermilevel. As the Dirac bands are derived from In-orbitals, they occur in allfamily members irrespective of the transition metal (Co,Rh,Ir). We present theexpected Fermi-arc surface state patterns and show the close proximity of atopological Lifshitz transition, which possibly explains the high field physicsof Ce-115 materials. Experimentally, we highlight the surprising similarity ofCe(Co,Rh,Ir)In$_5$ in high magnetic fields, despite the distinctly differentstates of the Ce-$4f$ electrons. These results raise questions about the roleDirac fermions play in exotic transport behavior, and we propose this class ofmaterials as a prime candidate for unconventional topologicalsuperconductivity.

Dirac fermions in the heavy-fermion superconductors Ce(Co,Rh,Ir)In$_5$