双色驱动非常规磁体中的完整磁性层级
Complete Magnetic Hierarchy in Bichromatically Driven Unconventional Magnets
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中文总结 AI 辅助
本文提出双色驱动框架，揭示非常规磁体磁性层级完整机制，并以d波交替磁体为例证明驱动不对称性产生动量不对称色散，为动态工程化非常规磁性提供通用途径。
中文摘要 AI 辅助
我们建立了一个利用双色驱动工程化非常规磁性的通用框架。我们识别出一个清晰的层级：对于具有一般偶数可公度频率比的双色驱动，领先的连续介质$q$-波磁体仅产生最高到$q-2$阶的分量，而晶格高阶梯度项提供了缺失的$q-1$和$q$阶奇偶性，并通过$q$阶完善了该层级。我们以圆-线偏振光照射的$d$-波交替磁体为例，明确展示了这一新的修正层级，并表明驱动场的不对称性被转移到光修饰的电子结构中，产生超出静态和单频极限的动量不对称色散。我们进一步表明，这种能带不对称性在领先的连续介质展开中不存在，而是源于由双色驱动转换为动量奇次贡献的高阶梯度晶格项。将分析扩展到高阶非常规磁体，我们进一步获得了所有$q$-奇偶性非常规磁体的完整磁性层级。我们的结果确立了双色Floquet驱动作为生成混合奇偶性磁性层级和动态工程化非常规磁性的通用途径。
英文摘要
We establish a general framework for engineering unconventional magnetism using bichromatic driving. We identify a sharp hierarchy: for a bichromatic drive with a generic even commensurate frequency ratio, the leading continuum $q$-wave magnet generates components only up to order $q-2$, whereas lattice higher-gradient terms supply the missing $q-1$ and $q$ parities and complete the hierarchy through order $q$. We explicitly illustrate this new revised hierarchy on a $d$-wave altermagnet irradiated by a circularly-linearly polarized light, and show that the asymmetry of the driving field is transferred to the light-dressed electronic structure, producing momentum-asymmetric dispersions beyond the static and single-frequency limits. We further show that this band asymmetry is absent in the leading continuum expansion and originates from higher-gradient lattice terms that are converted by the bichromatic drive into odd-in-momentum contributions. Extending the analysis to higher-order unconventional magnets, we further obtain complete magnetic hierarchies for all $q$-parity unconventional magnets. Our results establish bichromatic Floquet driving as a general route for generating mixed-parity magnetic hierarchies and dynamically engineering unconventional magnetism.
发表机构
- University of Florence（佛罗伦萨大学）
- University of Pennsylvania（宾夕法尼亚大学）
机构由 AI 辅助整理，请以论文原文为准。
