AI 中文总结
研究通过腔真空涨落控制材料极化和磁化，从无光子量子电动力学哈密顿量出发，确定允许腔诱导响应的点群，基于对称性分析得出响应张量形式，以α -石英和反铁磁Mn₃Sn为例展示控制效果，确立对称性为腔材料工程指导原则。
AI 中文摘要
腔光与物质相互作用已成为一种无需驱动场就能操纵材料特性的新途径。本文证明腔真空涨落能诱导宏观极化（磁化），即便在自由空间中缺乏自发极化（净磁化）的材料里。从有效的无光子量子电动力学哈密顿量出发，确定了允许此类腔诱导响应的所有晶体（磁）点群。基于对称性分析得出相应响应张量形式，其元素可通过量子电动力学密度泛函理论计算得到。以α -石英和反铁磁Mn₃Sn为例，展示了腔诱导极化和磁化的控制。该工作确立对称性为腔材料工程的指导原则，提供了通过量子真空涨落控制极化和磁化的途径。
英文摘要
Cavity light-matter interaction has recently emerged as a new avenue for manipulating material properties without driving fields. Here, we demonstrate that cavity vacuum fluctuations can induce macroscopic polarization (magnetization), even in materials that lack spontaneous polarization (net magnetization) in free space. Starting from the effective photon-free quantum-electrodynamics Hamiltonian, we identify all crystallographic (magnetic) point groups that allow such cavity-induced responses. We derive the form of the corresponding response tensors based on symmetry analysis, whose elements can be obtained by quantum electrodynamical density functional theory (QEDFT) calculations. As representative examples, we show that the cavity-induced polarization in $α$-quartz can be continuously controlled by rotating the cavity. For antiferromagnetic Mn$_3$Sn, we demonstrate that cavity-induced symmetry breaking generates an out-of-plane magnetization, accompanied by an anomalous Hall conductivity component that is forbidden outside the cavity. Our work establishes symmetry as a guiding principle for cavity materials engineering and provides a route for controlling polarization and magnetization through quantum vacuum fluctuations, i.e., cavity materials engineering.
