论文标题
通过手性声子在合成磁氧化物异质结构中通过手性声子进行非常规的互换耦合
Unconventional interlayer exchange coupling via chiral phonons in synthetic magnetic oxide heterostructures
论文作者
论文摘要
手性对称性的打破声子在出现的量子现象中起着至关重要的作用，因为它与自旋的自由度强大。但是，缺乏手性声子旋转耦合的直接实验证据。在这项研究中，我们报告了原子控制的铁磁金属（SRRUO3） - 非磁性绝缘体（SRTIO3）异质结构中的手性声子介导的层间交换相互作用。由于非常规层间交换相互作用，我们观察到磁矩的旋转是非磁性绝缘间隔厚度的函数，导致旋转螺旋状态。 Zeeman效应进一步证实了手性声子旋转耦合。手性声子的存在及其与旋转的相互作用以及我们的原子尺度异质结构方法打开了一个窗口，以揭示手性声子在磁性材料中的关键作用。
Chiral symmetry breaking of phonons plays an essential role in emergent quantum phenomena owing to its strong coupling to spin degree of freedom. However, direct experimental evidence of the chiral phonon-spin coupling is lacking. In this study, we report a chiral phonon-mediated interlayer exchange interaction in atomically controlled ferromagnetic metal (SrRuO3)-nonmagnetic insulator (SrTiO3) heterostructures. Owing to the unconventional interlayer exchange interaction, we have observed rotation of magnetic moments as a function of nonmagnetic insulating spacer thickness, resulting in a spin spiral state. The chiral phonon-spin coupling is further confirmed by phonon Zeeman effects. The existence of the chiral phonons and their interplay with spins along with our atomic-scale heterostructure approach open a window to unveil the crucial roles of chiral phonons in magnetic materials.
