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In-Plane Anomalous Features in the 3D Quantum Hall Regime
1Beijing Academy of Quantum Information Sciences, Beijing 100193, China.
Physical Review Letters
|January 30, 2026
Summary
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.
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.
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