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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Unconventional Hall effect induced by Berry curvature.

Jun Ge1, Da Ma1, Yanzhao Liu1

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.

National Science Review
|October 25, 2021
PubMed
Summary

Researchers discovered a novel Hall effect in topological material ZrTe5 flakes. This finding in topological physics reveals new insights into Berry phase effects and magnetotransport properties.

Keywords:
Berry curvatureBerry phase effectHall effecttilted Weyl semimetaltopological material

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Materials

Background:

  • Berry phase and Berry curvature are fundamental to topological physics.
  • These phenomena significantly influence transport properties in solid-state systems.

Purpose of the Study:

  • To investigate the Hall effect in topological material ZrTe5 flakes.
  • To explore magnetotransport properties under in-plane magnetic fields.

Main Methods:

  • Experimental measurement of Hall effect in ZrTe5 flakes.
  • Application of in-plane magnetic fields parallel and perpendicular to the current.
  • Theoretical analysis of magnetotransport properties.

Main Results:

  • Observation of a novel, nonzero Hall effect in ZrTe5 flakes.
  • Detection of both symmetric and antisymmetric components in in-plane Hall resistivity.
  • Identification of anomalous velocity induced by Berry curvature as the origin.

Conclusions:

  • The study reveals novel magnetotransport phenomena in topological materials.
  • Findings enrich the understanding of the Hall effect family.
  • Provides new insights into the role of Berry phase in topological materials.