非中心对称金属中的对称隔离磁电光效应

中文摘要 AI 辅助

我们对描述时间反演对称、非中心对称金属中金属光学和磁电光（EO）效应的贝里曲率偶极子$\mathbf{D}$、回转磁张量$\mathbf{K}$和磁电光张量$\mathbf{G}$的对称约束形式进行了分类。确定了11个空间群，其中$\mathbf{D}$和$\mathbf{K}$因对称性消失而$\mathbf{G}$仍被允许，为观察与$\mathbf{G}$相关的磁电光效应提供了更直接途径。第一性原理计算证实代表性材料中$\mathbf{D}$和$\mathbf{K}$消失，$\mathbf{G}$可通过费米能级移动进行调节。还表明空间群和实验配置的选择为隔离$\mathbf{G}$驱动的EO效应提供了互补路径，在斜入射几何中，$\mathbf{D}$驱动的响应产生螺旋度偶数的吸收或增益校正，$\mathbf{G}$驱动的响应耦合$s$和$p$光学扇区并产生具有特征$\sin\theta\cos\theta$角度依赖性的偏置诱导圆二色性，为分离非中心对称金属中$\mathbf{D}$和$\mathbf{G}$驱动的EO特征提供了直接实验途径。

英文摘要

We classify the symmetry-constrained forms of the Berry curvature dipole $\mathbf{D}$, gyrotropic magnetic tensor $\mathbf{K}$, and magnetoelectric electro-optic (EO) tensor $\mathbf{G}$, which describe metallic optical and EO effects in time-reversal symmetric, noncentrosymmetric metals. We identify 11 space groups (SGs) in which $\mathbf{D}$ and $\mathbf{K}$ vanish by symmetry while $\mathbf{G}$ remains allowed, thereby providing a more direct route to observing the recently predicted magnetoelectric EO effects associated with $\mathbf{G}$. First-principles based calculations confirm that $\mathbf{D}$ and $\mathbf{K}$ vanish for representative materials, while $\mathbf{G}$ remains allowed and tunable via Fermi level shifting. We further show that the choices of SG and experimental configuration provide complementary paths for isolating $\mathbf{G}$-driven EO effects, including cases where $\mathbf{D}$ and $\mathbf{K}$ are also symmetry-allowed. In an oblique-incidence geometry, the $\mathbf{D}$-driven response produces a helicity-even absorption or gain correction, whereas the $\mathbf{G}$-driven response couples the $s$ and $p$ optical sectors and produces a bias-induced circular dichroism with a characteristic $\sinθ\cosθ$ angular dependence. This provides a direct experimental route for separating the $\mathbf{D}$- and $\mathbf{G}$-driven EO signatures in noncentrosymmetric metals.

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13 pages, 4 figures