发表机构
Jiangsu University of Science and Technology; Hubei University; Southern University of Science and Technology (SUSTech); Nanyang Technological University（江苏科技大学; 湖北大学; 南方科技大学; 南洋理工大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究探究二维d波交变磁体的拓扑性质，发现其范霍夫奇点的光导率特征由交变磁性诱导，确立光/磁光光谱学可作为相关体系狄拉克能隙与范霍夫奇点的灵敏探测手段。
AI 中文摘要
我们研究了具有自旋轨道耦合和塞曼劈裂的二维d波交变磁体的拓扑相、联合态密度（JDOS）、光导率及磁光响应。该体系在高对称点Γ、M、X和Y处具有狄拉克能隙。我们表明，联合态密度在对应狄拉克能隙频率处出现拐点，在范霍夫奇点处呈现显著峰值，其位置可通过交变磁序调控。这些特征体现在光导率中，其实部和虚部呈现互补特征。特别地，横向光导率中的范霍夫特征在无d波交变磁性时消失，揭示了交变磁诱导的范霍夫奇点光特征。最后，法拉第和克尔旋转继承了光导率的特征。我们的结果确立了光和磁光光谱学作为交变磁拓扑体系中狄拉克能隙和范霍夫奇点的灵敏探测手段。
英文摘要
We investigate the topological phases, joint density of states (JDOS), optical conductivities, and magneto-optical responses of a two-dimensional $d$-wave altermagnet with spin-orbit coupling and Zeeman splitting. The system hosts gapped Dirac points at the high-symmetry points $Γ$, $\textrm{M}$, $\textrm{X}$, and $\textrm{Y}$. We show that the JDOS exhibits kinks at the corresponding Dirac gap frequencies and pronounced peaks at Van Hove singularities, whose positions can be tuned by the altermagnetic order. These features are reflected in the optical conductivities, with complementary signatures in their real and imaginary parts. In particular, the Van Hove signatures in the transverse optical conductivity disappear in the absence of $d$-wave altermagnetism, revealing an altermagnet-induced optical signature of the Van Hove singularity. Finally, the Faraday and Kerr rotations exhibit characteristic features inherited from the optical conductivity. Our results establish optical and magneto-optical spectroscopy as sensitive probes of Dirac gaps and Van Hove singularities in altermagnetic topological systems.
Comments10 pages, 5 figures
