论文标题
与离散对称性的磁性纳米管中自旋波的模式分裂
Mode splitting of spin waves in magnetic nanotubes with discrete symmetries
论文作者
论文摘要
我们研究了几何形状如何影响多边形磁性纳米管中的自旋动力学。我们发现，降低纳米管的旋转对称性，通过减少平面面的数量，分解越来越多的自旋波模式，这些模式在圆柱管中偶尔地退化。这种对称性分裂是不同形式的拓扑形式，这是圆柱纳米管中最近观察到的拓扑形式。具有半数或整数的多个方面数量的双层模式，分为单元对，分为单线对，具有相反的镜面对称性的侧向站立轮廓。此外，多边形的几何形状有助于具有不同方位期时期的模式的杂交，但相同的对称性在避免的水平交叉处体现。这些现象在圆柱形几何形状中难以想象，为控制纳米级的旋转动力学提供了新的工具。提出的概念可以推广到多功能几何和顺序参数的纳米对象，从而为纳米级设备中的工程师动态响应提供了新的路线。
We investigate how geometry influences spin dynamics in polygonal magnetic nanotubes. We find that lowering the rotational symmetry of nanotubes by decreasing the number of planar facets, splits an increasing number of spin-wave modes, which are doubly degenerate in cylindrical tubes. This symmetry-governed splitting is distinct form the topological one recently observed in cylindrical nanotubes. Doublet modes with half-integer or integer multiple azimuthal periods of the number of facets, split to singlet pairs with lateral standing-wave profiles of opposing mirror-plane symmetries. Furthermore, the polygonal geometry facilitates the hybridization of modes with different azimuthal periods but the same symmetry, manifested in avoided level crossings. These phenomena, unimaginable in cylindrical geometry, provide new tools to control spin dynamics on nanoscale. The presented concept can be generalized to nano-objects of versatile geometries and order parameters, offering new routes to engineer dynamic response in nanoscale devices.
