标题： 层状反铁磁体CrSBr中的表面主导的量子度量诱导非线性输运现象 显示英文标题

标题： Surface-Dominated Quantum Metric-Induced Nonlinear Transport in the Layered Antiferromagnet CrSBr

摘要： 范德瓦尔斯（vdW）反铁磁体CrSBr因其空气稳定性、高磁转变温度和半导体性质，最近引起了广泛关注。 我们研究了它的非线性输运特性，并识别出一种由量子度量偶极子诱导的非线性反常霍尔效应和非线性纵向电阻率，其符号会随着奈尔矢量的反转而改变。 显著的量子度量偶极子来源于实验可实现掺杂范围内导带边缘附近的狄拉克节线。 考虑到层间耦合较弱，非线性电导率不随样品厚度按比例变化，而是主要由表面层贡献这一点并不意外。 在电子掺杂区域，顶层主导响应；而在空穴掺杂区域，前三层贡献最大。 我们的研究结果确立了拓扑节点线作为设计高性能非线性量子材料的指导原则，并表明表面敏感的输运装置将为非线性电子应用提供新的途径。 显示英文摘要

摘要： The van der Waals (vdW) antiferromagnet CrSBr has recently garnered significant attention due to its air stability, high magnetic transition temperature, and semiconducting properties. We investigate its nonlinear transport properties and identify a quantum metric dipole-induced nonlinear anomalous Hall effect and nonlinear longitudinal resistivity, which switch sign upon reversing the N\'eel vector. The significant quantum metric dipole originates from Dirac nodal lines near the conduction band edge within the experimentally achievable doping range. Known the weak interlayer coupling, it is unexpected that the nonlinear conductivities do not scale with sample thickness but are dominantly contributed by surface layers. In the electron-doped region, the top layer dominates the response while the top three layers contribute the most in the hole-doped region. Our results establish topological nodal lines as a guiding principle to design high-performance nonlinear quantum materials and suggest that surface-sensitive transport devices will provide new avenues for nonlinear electronic applications.