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Intrinsic dipole Hall effect in twisted MoTe2: magnetoelectricity and contact-free signatures of topological transitions

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  • Feng-Ren Fan

    (University of Hong Kong
    HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong)

  • Cong Xiao

    (HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong
    University of Macau)

  • Wang Yao

    (University of Hong Kong
    HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong)

Abstract

We discover an intrinsic dipole Hall effect in a variety of magnetic insulating states at integer fillings of twisted MoTe2 moiré superlattice, including topologically trivial and nontrivial ferro-, antiferro-, and ferri-magnetic configurations. The dipole Hall current, in linear response to in-plane electric field, generates an in-plane orbital magnetization M∥ along the field, through which an AC field can drive magnetization oscillation up to THz range. Upon the continuous topological phase transitions from trivial to quantum anomalous Hall states in both ferromagnetic and antiferromagnetic configurations, the dipole Hall current and M∥ have an abrupt sign change, enabling contact-free detection of the transitions through the magnetic stray field. In configurations where the linear response is forbidden by symmetry, the dipole Hall current and M∥ appear as a crossed nonlinear response to both in-plane and out-of-plane electric fields. These magnetoelectric phenomena showcase fascinating functionalities of insulators from the interplay between magnetism, topology, and electrical polarization.

Suggested Citation

  • Feng-Ren Fan & Cong Xiao & Wang Yao, 2024. "Intrinsic dipole Hall effect in twisted MoTe2: magnetoelectricity and contact-free signatures of topological transitions," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52314-5
    DOI: 10.1038/s41467-024-52314-5
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