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arXiv 2510.23971cond-mat.mes-hall
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$\u001b[1mPT\u001b[0m$对称反铁磁绝缘体中的非线性层霍尔效应与隐藏贝里曲率偶极子的探测

Nonlinear Layer Hall Effect and Detection of the Hidden Berry Curvature Dipole in $\mathcal{PT}$-Symmetric Antiferromagnetic Insulators

Zhuo-Hua Chen, Hou-Jian Duan, Ming-Xun Deng, Rui-Qiang Wang

AI总结:

本研究预测了PT对称层状反铁磁体中的非线性层霍尔效应,明确其与线性效应的对称性差异,区分了隐藏贝里曲率偶极子和量子度量偶极子诱导的霍尔电流特征,为探测隐藏贝里曲率偶极子量子几何提供了实验可行的新框架。

摘要:

近期的实验与理论研究揭示,在MnBi₂Te₄薄膜中,由隐藏贝里曲率诱导产生了线性层霍尔效应(LHE)。这一现象凸显了层自由度作为层状材料中产生霍尔输运的新机制,为探测和操控完全补偿拓扑反铁磁体(AFMs)的内部结构提供了新途径。在本工作中,我们预测了$\u001b[1mPT\u001b[0m$对称层状反铁磁体中存在非线性层霍尔效应,与线性层霍尔效应不同,该效应表现为可探测的非线性霍尔电导率,其关于反铁磁序为偶,关于垂直电场为奇。此外,我们证明由隐藏贝里曲率偶极子(BCD)和量子度量偶极子(QMD)诱导的非线性霍尔电流遵循不同的对称性,且沿不同方向流动。我们提出的非线性层霍尔效应构建了一个具备实验优势的框架,可用于专门探测隐藏BCD的量子几何。

英文摘要:

Recent experimental and theoretical studies have revealed the emergence of a linear layer Hall effect (LHE) induced by hidden Berry curvature in \textrm{MnBi}$_{2}$\textrm{Te}$_{4}$ thin films. This phenomenon underscores the layer degree of freedom as a novel mechanism for generating Hall transport in layered materials, providing a new pathway to probe and manipulate the internal structure of fully compensated topological antiferromagnets (AFMs). In this work, we predict a nonlinear LHE in $\mathcal{PT}$-symmetric layered AFMs, which manifests as a detectable nonlinear Hall conductivity even with respect to the AFM order and odd with respect to the vertical electric field, in contrast to the linear LHE. Furthermore, we demonstrate that the nonlinear Hall currents induced by the hidden BCD and quantum metric dipole (QMD) obey distinct symmetries and flow in different directions. Our proposed nonlinear LHE establishes an experimentally advantageous framework for exclusively probing the hidden BCD quantum geometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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