通过非线性磁振子整流实现光诱导的弱铁磁性
Light-induced weak ferromagnetism through nonlinear magnonic rectification
AI总结：
本文提出一种针对磁化的非线性磁振子整流机制，通过相干激发手性声子模式产生有效磁场诱导瞬态自旋倾斜，在反铁磁体中实现光诱导的弱铁磁性，为创建非平衡态下的动态自旋构型提供了新途径。
摘要：
整流描述了从振荡场中产生准静态分量的过程，例如光学整流中的电极化，或非线性声子整流中的结构畸变。在此，我们提出了一种针对磁化的第三个基本过程，其中自旋进动在反铁磁体中沿非线性驱动的磁振子模式的坐标被整流。我们在理论上证明，通过瞬态自旋倾斜可以诱导出准静态磁化，这是响应手性声子模式的相干激发而产生的，该声子模式为自旋产生了有效磁场。我们称这种机制为非线性磁振子整流，它普遍适用于表现出红外活性手性声子模式的磁系统。我们的结果作为光诱导弱铁磁性的一个例子，为创建在平衡态下无法实现的动态自旋构型开辟了一条有前景的途径。
英文摘要：
Rectification describes the generation of a quasistatic component from an oscillating field, such as an electric polarization in optical rectification, or a structural distortion in nonlinear phononic rectification. Here, we present a third fundamental process for magnetization, in which spin precession is rectified along the coordinates of a nonlinearly driven magnon mode in an antiferromagnet. We demonstrate theoretically that a quasistatic magnetization can be induced by transient spin canting in response to the coherent excitation of a chiral phonon mode that produces an effective magnetic field for the spins. This mechanism, which we call nonlinear magnonic rectification, is generally applicable to magnetic systems that exhibit infrared-active chiral phonon modes. Our results serve as an example of light-induced weak ferromagnetism and open a promising avenue towards creating dynamical spin configurations that are not accessible in equilibrium.
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