Induced anomalous Hall effect of massive Dirac fermions in ZrTe5 and HfTe5 thin flakes

Abstract

Researches on anomalous Hall effect (AHE) have been lasting for a century to make clear the underlying physical mechanism. Generally, the AHE appears in magnetic materials, in which extrinsic process related to scattering effects and intrinsic contribution connected with Berry curvature are crucial. Recently, AHE has been counterintuitively observed in non-magnetic topological materials and attributed to the existence of Weyl points. However, the Weyl point scenario would lead to unsaturated AHE even in large magnetic fields and contradicts the saturation of AHE in several tesla (T) in experiments. In this work, we investigate the Hall effect of ZrTe5 and HfTe5 thin flakes in static ultrahigh magnetic fields up to 33 T. We find the AHE saturates to 55 (70) Ohm^-1*cm^-1 for ZrTe5 (HfTe5) thin flakes above ~ 10 T. Combining detailed magnetotransport experiments and Berry curvature calculations, we clarify that the splitting of massive Dirac bands without Weyl points can be responsible for AHE in non-magnetic topological materials ZrTe5 and HfTe5 thin flakes. This model can identify our thin flake samples to be weak topological insulators and serve as a new tool to probe the band structure topology in topological materials.

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• Extremely large anomalous Hall conductivity and unusual axial diamagnetism in a quasi-1D Dirac material La${}_3$MgBi${}_5$
• Gate-tunable multiband transport in ZrTe5 thin devices
• First-principles methodology for studying magnetotransport in narrow-gap semiconductors: an application to Zirconium Pentatelluride ZrTe5
• Revealing temperature evolution of the Dirac band in ZrTe${}_5$ via magneto-infrared spectroscopy
• Magnetic-field-induced nonlinear transport in HfTe5
• Unconventional optical selection rules in ZrTe5 under an in-plane magnetic field
• Theory of anomalous Hall effect in transition-metal pentatelluride ${\mathrm{ZrTe}}_5$ and ${\mathrm{HfTe}}_5$
• Anomalous Hall effect in Dirac semimetal probed by in-plane magnetic field
• Crossover behavior in the magnetoresistance of thin flakes of the topological material ZrTe5
• Discrete scale invariance of the quasi-bound states at atomic vacancies in a topological material
• Magneto-Seebeck coefficient of Fermi-liquid in three-dimensional Dirac/Weyl semimetal
• Spin-Triplet Excitonic Insulator in the Ultra-Quantum Limit of HfTe5
• Pseudo anomalous Hall effect in semiconductors and semimetals: A classical perspective
• Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co${}_2$MnSn