Chiral anomaly across the Lifshitz transition in ZrTe₅

A key property of Weyl and Dirac semimetals is the near conservation of chiral charge. The presence of collinear electric and magnetic fields leads to the non-conservation of chiral charge density through the chiral anomaly. Given the strong Berry curvature and near conservation of chiral charge in Weyl and Dirac semimetals, the chiral anomaly can give rise to measurable effects such as the chiral magnetic effect (CME) and the planar Hall effect (PHE). In this work, we study the chiral anomaly across the temperature-induced Lifshitz transition, in which the Fermi level goes from the conduction to the valence band with increasing temperature, by performing measurements of the CME and PHE in ZrTe₅ in a broad temperature range and high magnetic fields. Our results provide insight into the effect of the Lifshitz transition on the chiral anomaly in topological semimetals.