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

作者：Ruobing Mei, Daniel Kaplan, Binghai Yan, Cui‐Zu Chang, Chao‐Xing Liu · 发表于：Physical review. B./Physical review. B · 年份：2024 · DOI：10.1103/physrevb.110.165401 · 被引用次数：7 · 研究领域：Topological Materials and Phenomena、Graphene research and applications、Photonic Crystals and Applications

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 ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$. 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.