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Updated: May 31, 2026
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
In-plane anomalous Hall effect in a low-dimensional system
I-Hsuan Kao1, Ravi Kumar Bandapelli1, Zhenhong Cui1
1Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA.
Nature Materials
|May 28, 2026
Summary
Researchers discovered an unconventional in-plane anomalous Hall effect (AHE) in a novel heterostructure. This tunable effect, controlled by gate voltage, opens new avenues for quantum material applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- The anomalous Hall effect (AHE) in magnetic systems traditionally links Hall response to out-of-plane magnetization due to symmetry constraints.
- Existing AHE research is largely governed by specific symmetry requirements, limiting observed phenomena.
Purpose of the Study:
- To demonstrate and investigate an unconventional in-plane anomalous Hall effect (AHE) in a low-dimensional heterostructure.
- To explore the role of reduced symmetry and magnetization orientation in driving novel Hall responses.
- To establish electrostatic control over the AHE in engineered quantum materials.
Main Methods:
- Fabrication of a heterostructure by interfacing a low-symmetry topological semimetal with a ferromagnetic insulator.
- Experimental measurement of the Hall effect across multiple devices under varying conditions.
- Development of a minimal symmetry-constrained microscopic model to elucidate the underlying physics.
Main Results:
- Demonstrated the emergence of an in-plane AHE in the engineered heterostructure, deviating from conventional out-of-plane dependence.
- Observed a gate-tunable AHE, confirming electrostatic control over the effect.
- Identified interfacial spin-orbit coupling and exchange interaction as key mechanisms driving the multidirectional AHE.
Conclusions:
- The study successfully realized and characterized an unconventional in-plane AHE driven by broken mirror symmetry in a low-dimensional system.
- The findings highlight the potential of interfacial spin-orbit coupling and exchange interactions in engineering novel electronic transport phenomena.
- This work provides a new pathway for designing tunable, symmetry-driven Hall effects in low-dimensional quantum materials.
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