非线性特勒根极限
Nonlinear Tellegen limit
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中文总结 AI 辅助
研究磁电介质中非线性磁电耦合产生的新特勒根极限，其场可调，通过在两个磁有序材料系统中展示极限及相图，表明磁点群对称性控制非线性磁电张量结构与电磁不稳定性。
中文摘要 AI 辅助
特勒根极限是磁电介质的基本电磁稳定性界限。我们表明，非线性磁电耦合产生了一个新的特勒根极限，即非线性特勒根极限。与由材料参数固定的线性特勒根极限不同，非线性特勒根极限是场可调的——静态电场或磁场在由磁点群对称性确定的特定材料临界场处驱动系统走向电磁不稳定性。接近此极限时伴随着场可调的法拉第旋转，其随外加场线性增长，并由非线性特勒根极限设定的通用最大值上限——超过此值介质变得电磁不稳定。我们在两个磁有序材料系统——d波交替磁体和M型六角铁氧体——中展示了非线性特勒根极限和场空间稳定性相图，表明磁点群的对称性控制着非线性磁电张量的结构以及由此产生的电磁不稳定性。
英文摘要
The Tellegen limit is the fundamental electromagnetic stability bound on magnetoelectric media. We show that nonlinear magnetoelectric coupling gives rise to a new Tellegen limit, which we term the nonlinear Tellegen limit. Unlike the linear Tellegen limit, which is fixed by material parameters, the nonlinear Tellegen limit is field-tunable -- a static electric or magnetic field drives the system toward electromagnetic instability at a material-specific critical field determined by the magnetic point group symmetry. The approach to this limit is accompanied by a field-tunable Faraday rotation that grows linearly with the applied field and is bounded from above by a universal maximum set by the nonlinear Tellegen limit -- beyond which the medium becomes electromagnetically unstable. We demonstrate the nonlinear Tellegen limit and the field-space stability phase diagram in two magnetically ordered material systems -- a d-wave altermagnet and an M-type hexagonal ferrite -- showing that the symmetry of the magnetic point group governs both the structure of the nonlinear magnetoelectric tensor and the resulting electromagnetic instability.
