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In-Plane Anomalous Features in the 3D Quantum Hall Regime.

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New research reveals novel transport phenomena in 3D Weyl semimetals under quantum Hall effect conditions. Applying an in-plane magnetic field uncovers unique quantum oscillations and negative longitudinal resistance, challenging existing topological characterizations.

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Area of Science:

  • Condensed Matter Physics
  • Topological Materials
  • Quantum Phenomena

Background:

  • Traditional studies of the 3D quantum Hall effect (QHE) focus on 2D QHE-like transport features.
  • 3D Weyl semimetals exhibit unique electronic properties due to their band structure.

Purpose of the Study:

  • To investigate novel transport phenomena in 3D Weyl semimetals under quantum Hall conditions with an in-plane magnetic field.
  • To explore the breakdown of topological characterization in 3D QHE systems.

Main Methods:

  • Application of an in-plane magnetic field to a 3D Weyl semimetal in the quantum Hall regime.
  • Analysis of Hall quantum oscillations, two-terminal magnetoresistance, and longitudinal resistance.
  • Investigation of nonlocal quantum backscattering channels.

Main Results:

  • Observation of an unexpected Hall quantum oscillation distinct from Weyl-orbit oscillations.
  • Coexistence of QHE with unquantized two-terminal magnetoresistance.
  • Discovery of negative, disorder-robust longitudinal resistance and tunable quantization.
  • Identification of nonlocal quantum backscattering as the underlying mechanism.

Conclusions:

  • The study reveals qualitatively new transport features in 3D QHE beyond 2D analogies.
  • Existing topological characterizations, even with 3D Chern numbers, are insufficient for these systems.
  • Hidden 3D QHE transport properties are uncovered, opening new avenues for research and measurement.