太赫兹辐射
凝聚态物理
克尔效应
响应度
磁光克尔效应
霍尔效应
物理
磁化
超晶格
自旋霍尔效应
非线性系统
光学
磁场
量子力学
自旋极化
光电探测器
电子
作者
Diego García Ovalle,Armando Pezo,Aurélien Manchon
出处
期刊:Cornell University - arXiv
日期:2023-01-01
标识
DOI:10.48550/arxiv.2311.11889
摘要
We investigate the optical response induced by a d.c. current flowing in a nonmagnetic material that lacks inversion symmetry. In this class of materials, the flowing current experiences a nonlinear Hall effect and induces a nonequilibrium orbital magnetization, even in the absence of spin-orbit coupling. As a result, an orbital-driven Kerr effect arises that can be used to probe not only the orbital magnetization, but also the nonlinear Hall effect. In addition, in the long wavelength limit, the nonlinear Hall effect leads to a rectification current that can be used to detect terahertz radiation. We apply the theory to selected model systems, such as WTe$_2$ bilayer, as well as to realistic materials, i.e., bulk Te and metallic superlattices. The nonequilibrium orbital Kerr efficiencies obtained in these systems are comparable to the largest values reported experimentally in GaAs and MoS$_2$, exceeding the values reported in metals and suggesting a large terahertz current responsivity.
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