Zirconium pentatelluride $\mathrm{Zr}{\mathrm{Te}}_5$ is a topological semimetal. The presence of a temperature-induced Lifshitz transition, in which the Fermi level goes from the conduction band to the valence band with increasing temperature, provides unique opportunities to study the interplay between Fermi-surface topology, dynamics of Dirac fermions, and Berry curvature in one system. Here we present a combined experimental and theoretical study and show that a low-energy model can be used to understand the complicated Hall response and large anomalous Hall effect observed in $\mathrm{Zr}{\mathrm{Te}}_5$ over a wide range of temperature and magnetic field. We found that the anomalous Hall contribution dominates the Hall response in a narrow temperature window around the Lifshitz transition, away from which the orbital contribution dominates. Moreover, our results indicate that a topological phase transition coexists with the Lifshitz transition. Our model provides a unifying framework to understand the Hall effect in semimetals with large Zeeman splitting and nontrivial topology.

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• Anomalous Hall effect
• Dirac fermions
• Hall effect
• Spin-orbit coupling
• Symmetry protected topological states
• Topological materials
• Topological phase transition