发表机构
Rice University; Smalley-Curl Institute, Rice University; Rice Center for Quantum Materials, Rice University（莱斯大学; 斯马利-柯尔研究所，莱斯大学; 莱斯量子材料中心，莱斯大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究构建原型Kondo晶格模型，证明对称性强制的Kramers手性Weyl费米子及圆光电流效应中的尖锐频域峰，为强关联拓扑费米子提供光谱识别途径。
AI 中文摘要
手性Weyl-Kondo半金属（cWKSM）提供了一个在强关联手性重费米子体系中，由Kondo驱动的强关联电子态重构使得手性Weyl准粒子在费米能量附近涌现的物理场景（K.-S. Lin等人，arXiv:2602.22185）。该强关联拓扑态的一个标志性特征是低能准粒子态中的Kramers手性Weyl费米子。近期，CeGaGe中的实验已成为所提出效应的具体实现（Arushi等人，预印本）。受这些发现的启发，我们在此超越材料特定效应，构建了一个原型Kondo晶格模型；该模型仅包含尊重相关四方晶体对称性的必要耦合。这一简化使我们能够稳健地展示重准粒子谱中由对称性强制的Kramers Weyl费米子及相关拓扑节点态。此外，该简化提供了一个易于处理的框架，用以确定系统在手性Weyl-Kondo半金属中的非线性光学响应——圆光电流效应——的显著特征。解析和数值计算均识别出频域中的尖锐峰，作为Kondo驱动的手性Weyl节点的特征；谱的尖锐性反映了底层强关联电子激发的共振性质。因此，cWKSM为光谱学识别由强电子关联诱导的拓扑费米子提供了独特平台。由此，我们的结果有望为理解强关联无带隙拓扑物质带来亟需的新见解。
英文摘要
Chiral Weyl--Kondo semimetals (cWKSM) provide a setting in which chiral Weyl quasiparticles emerge in the immediate vicinity of the Fermi energy from a Kondo-driven reconstruction of the strongly correlated electronic states in chiral heavy fermion systems (K.-S. Lin et al., arXiv:2602.22185). A defining characteristic of this strongly correlated topological state is the Kramers chiral Weyl fermions in the low-energy quasiparticle states. Recently, experiments in CeGaGe have emerged as a concrete realization of the proposed effect (Arushi et al., preprint). Motivated by these findings, here we go beyond the materials-specific effects by constructing a prototype Kondo lattice model; it incorporates only the essential couplings that respect the associated tetragonal crystalline symmetries. This simplification allows us to robustly demonstrate the symmetry-enforced Kramers Weyl fermions and related topological nodal states in the spectrum of heavy quasiparticles. Furthermore, the simplification provides a tractable setting to determine the salient features in the system's nonlinear optical response, the circular photogalvanic effect, in chiral Weyl--Kondo semimetals. Both analytical and numerical calculations identify sharp peaks in the frequency domain as signatures of the Kondo-driven chiral Weyl nodes; the sharpness of the spectrum reflects the resonant nature of the underlying strongly correlated electronic excitations. Thus, cWKSM provides a unique setting to spectroscopically identify topological fermions that are induced by strong electron correlations. As such, our results are expected to bring about much needed new insights into the understanding of strongly correlated gapless topological matter.
Comments6 + 6 pages, 3 + 1 figures
