标题： 由单层WTe2中非线性输运引起的电光克尔效应 显示英文标题

标题： Electro-optic Kerr Effect Induced by Nonlinear Transport in monolayer WTe2

摘要： 非线性霍尔效应（NLHE）可以通过修改材料的介电张量来引起光学各向异性，为新颖的表征和器件应用提供了机会。 虽然磁光 Kerr 效应（MOKE）用于探测磁性材料中的线性霍尔效应（LHE），但在非磁性、时间反演对称系统中，类似 NLHE 的光学探测方法仍然非常渴望。 在这里，我们理论上提出并研究了一种由 NLHE 引起的电光 Kerr 效应（EOKE）作为这样的探测方法。 聚焦于单层（ML）WTe$_2$，一种典型的 NLHE 材料，我们的分析考虑了贝里曲率偶极子（BCD）、德鲁德、注入和位移机制的贡献。 我们证明 WTe$_2$中的 EOKE 信号主要由 BCD 控制。 此外，Kerr 角在不同光学频率下表现出时间振荡，表明 EOKE 是检测 NLHE 和动态研究材料拓扑结构的一种有前景的途径。 显示英文摘要

摘要： The nonlinear Hall effect (NLHE) can induce optical anisotropy by modifying a material's dielectric tensor, presenting opportunities for novel characterization and device applications. While the magneto-optical Kerr effect (MOKE) probes the linear Hall effect (LHE) in magnetic materials, an analogous optical probe for NLHE in non-magnetic, time-reversal symmetric systems remains highly desirable. Here, we theoretically propose and investigate an NLHE-induced Electro-optic Kerr Effect (EOKE) as such a probe. Focusing on monolayer (ML) WTe$_2$, a prototypical NLHE material, our analysis considers contributions from Berry curvature dipole (BCD), Drude, injection, and shift mechanisms. We demonstrate that the EOKE signal in WTe$_2$ is predominantly governed by the BCD. Furthermore, the Kerr angle exhibits temporal oscillations at different optical frequencies, suggesting EOKE as a promising route for the time-resolved detection of NLHE and the dynamic investigation of material topology.