Electrical control of intrinsic nonlinear Hall effect in antiferromagnetic topological insulator sandwiches

Ruobing Mei; Daniel Kaplan; Binghai Yan; Cui-Zu Chang; Chao-Xing Liu

doi:10.1103/PhysRevB.110.165401

Electrical control of intrinsic nonlinear Hall effect in antiferromagnetic topological insulator sandwiches

Mesoscale and Nanoscale Physics 2024-10-28 v1 Materials Science

Authors: Ruobing Mei , Daniel Kaplan , Binghai Yan , Cui-Zu Chang , Chao-Xing Liu

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Abstract

Nonlinear Hall effect (NHE) can originate from the quantum metric mechanism in antiferromagnetic topological materials with PT symmetry, which has been experimentally observed in MnBi2Te4. In this work, we propose that breaking PT symmetry via external electric fields can lead to a dramatic enhancement of NHE, thus allowing for an electric control of NHE. Microscopically, this is because breaking PT symmetry can lift spin degeneracy of a Kramers' pair, giving rise to additional contributions within one Kramers' pair of bands. We demonstrate this enhancement through a model Hamiltonian that describes an antiferromagnetic topological insulator sandwich structure.

Keywords

nonlinear Hall effect antiferromagnetic topological insulator PT symmetry electric field control Kramers pair spin degeneracy

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@article{arxiv.2406.02738,
  title  = {Electrical control of intrinsic nonlinear Hall effect in antiferromagnetic topological insulator sandwiches},
  author = {Ruobing Mei and Daniel Kaplan and Binghai Yan and Cui-Zu Chang and Chao-Xing Liu},
  journal= {arXiv preprint arXiv:2406.02738},
  year   = {2024}
}

Electrical control of intrinsic nonlinear Hall effect in antiferromagnetic topological insulator sandwiches

Abstract

Keywords

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