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

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

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

A 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 paper, 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 the 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.

Original language	English (US)
Article number	165401
Journal	Physical Review B
Volume	110
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.110.165401
State	Published - Oct 15 2024

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.110.165401

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abstract = "A 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 paper, 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 the 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.",

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AB - A 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 paper, 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 the 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.

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

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