Induced anomalous Hall effect of massive Dirac fermionsin ZrTe5 and HfTe5 thin flakes
Journal Article
·
· Physical Review B
- Peking Univ., Beijing (China). International Center for Quantum Materials
- Sun Yat-Sen Univ., Guangzhou (China). School of Physics
- Weizmann Inst. of Science, Rehovot (Israel). Dept. of Condensed Matter Physics
- Chinese Academy of Sciences (CAS), Anhui (China). High Magnetic Field Laboratory
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Peking Univ., Beijing (China). International Center for Quantum Materials; Chinese Academy of Sciences (CAS), Beijing (China). CAS Center of Excellence in Topological Quantum Computation; Beijing Academy of Quantum Information Sciences, Beijing (China)
Research on the anomalous Hall effect (AHE) has been lasting for a century to make clear the underlying physical mechanism. Generally, the AHE appears in magnetic materials, in which the extrinsic process related to scattering effects and intrinsic contribution connected with Berry curvature are crucial. Recently, AHE has been counterintuitively observed in nonmagnetic 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)Ω1cm1 for ZrTe5 (HfTe5) thin flakes above ~10T. 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 nonmagnetic topological materials ZrTe5 and HfTe5 thin flakes. This model can identify our thin flake samples to be weak topological insulators and serve as a tool to probe the band structure topology in topological materials.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1819564
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 103; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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