发表机构
Department of Physics, Kyoto University（京都大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究采用动力学平均场理论，揭示反常磁体中关联驱动的光学非线性磁电效应，明确其相态依赖特性与调控规律，为探测关联反常磁序及最大化响应提供可行方案。
AI 中文摘要
我们采用动力学平均场理论研究强关联反常磁体中的光学非线性磁电效应（NMEE）。与引入自旋劈裂的有效能带描述不同，我们的方法自洽地确定了反常磁序、电子谱和光学非线性响应。研究发现，NMEE在反常磁相中有限，在顺磁相中消失；其频率依赖关系反映了自旋分辨的谱结构，可用于估算特征反常磁自旋劈裂尺度。相互作用和温度调控会产生质的差异：低温下，向相互作用驱动的磁相边界降低相互作用强度会增强响应，而升高温度会抑制响应，且在临界温度以上响应降至零。这些结果确立了光学NMEE作为探测关联反常磁序的手段，并表明向相互作用驱动的相边界调控压力、应变或化学取代等参数，有望成为最大化该响应的有效途径。
英文摘要
We investigate the optical nonlinear magnetoelectric effect (NMEE) in a strongly correlated altermagnet using dynamical mean-field theory. Unlike effective band descriptions with an imposed spin splitting, our approach determines the altermagnetic order, electronic spectrum, and optical nonlinear response self-consistently. We find that the NMEE is finite in the altermagnetic phase and vanishes in the paramagnetic phase. Its frequency dependence reflects the spin-resolved spectral structure and provides an estimate of the characteristic altermagnetic spin-splitting scale. Interaction and temperature tuning produce qualitatively different behavior: at low temperature, reducing the interaction strength toward the interaction-driven magnetic phase boundary enhances the response, whereas increasing the temperature suppresses it and drives it to zero above the critical temperature. These results establish the optical NMEE as a probe of correlated altermagnetic order and suggest that tuning parameters such as pressure, strain, or chemical substitution toward an interaction-driven phase boundary may provide a promising route to maximizing the response.
