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  3. In-plane Anomalous Hall Effect In A Low-dimensional System.
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  3. In-plane Anomalous Hall Effect In A Low-dimensional System.

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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

View abstract on PubMed

Summary
This summary is machine-generated.

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.

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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.